Disclaimer: It's a shame that I own neither Big Bang Theory nor BBC Sherlock.

You guys shouldn't have met each other

Big Bang Theory x BBC Sherlock

If there really were such thing as karma, Leonard Hofstader thought as he patiently closed his eyes, he must have a bloody first class seat reserved for him in heaven.

"Leonard, Leonard, Leonard."

Maybe he would get to sit right next to Jesus. Nobody could deny that he had a patience that would make any religious saints weep in defeat. Surely, no other saints had been tested as severely as him, with a personal torturing machine stuck to their sides.

"Leonard-"

Wouldn't strangling him be a sure fire way to stop this frustration?

"Leonard-"

Before strangling him, though, there was another work that should take precedence; going back to past and throttling the guy who invented airplanes. Just what kind of a sick sadist thought of a metal box that flies above 2600 feet, leaving people, who wanted to escape torture, only able to choose death?

"Leo-"

No, that's not right. Sheldon is the only bastard here.

"Why, Sheldon?" Leonard forced himself to speak calmly as he gritted his teeth. Huge eyes on a pale face stared at him blankly, and then rolled around in agitated fashion.

"-nard."

Leonard banged his head on the seat-head. Three hours and ten minutes. He had to wait more than three hours before he could get out of this airplane. How did this happen? Well, there was a short explanation for this.

Leonard was an idiot.

As concise and brilliant as this explanation was, it might confuse those who were not so familiar with our dear Sheldon.

So, the details of the event were like this; someone gave Sheldon two plane tickets for a conference in London. Surprising really, considering the fact that Sheldon had a corpuscle amount of social grace, but some crazy guy did just that. And that conference day just happened to be coinciding with the day on which Doctor Who Convention would be held in London. Penny also said that she would go camping with her friends on that day.

So poor Leonard predicted that he would be all bored and lonely that day and agreed to Sheldon asking(throwing tantrum at) him to go with him like the idiot he was. On retrospect, it was a mad thing to do. Why in the world did he decide to voluntarily crawl into this hellhole in which he would have to endure the torment of sitting next to Sheldon for hours with no escape?

And now Sheldon was babbling nonsense while poking Leonard on his side.

It was a shame that there wasn't an easily accessible gun on an airplane.

If there really were such thing as karma, John Watson thought as he patiently closed his eyes, he must have a bloody first class seat set out for him in heaven.

"Oh, Sherlock. Just stop it."

His genius flatmate was once again curled into a small ball on the sofa, only wearing his usual gown. At this state, it wouldn't surprise John even if Sherlock were to transform into blue fungi, merging together with his beloved sofa. Really, being all brooding like that just because he had no case for over 100 hours? Childish, that was what it was.

"Sherlock, are your really going to keep doing this?"

Thoroughly annoyed now, John threw down the papers he was reading on the table. The thing that had been facing the sofa wall wiggled a bit in response, and turned toward John. It then groggily woke up, only to walk to somewhere else like a ghost. John thought for a moment. What was in there?

The answer was simple. In a blink of an eye, a black object was held in Sherlock's hand. Goddamn it, how in the world did he figure out that the gun was hidden in a cereal box?

"Sherlock, don't-!"

Bang, bang, bang!

"Boring!"

"Oh, that's it." John muttered under his breath and stomped toward Sherlock. He sharply jerked the gun out of his flatmate's hand and glared at the guy who was more than a head taller than him. Really, with Sherlock, John was getting more and more tempted to go back to his 'bad days'.

"Get your clothes. We are going out."

It was a shame that there was an easily accessible gun in this flat.

"John, seriously?"

Sherlock said in an incredulous tone as he stared at the blue phone box in front of him. He raised his hands as if to stop this nonsense, and read the words on the banner in an overly slow and articulated manner. It was clear that he was mocking.

"'Doctor Who Convention'? Just what could have possibly made you to think that I'm going to enjoy it?"

"I didn't think that you would. But I would."

John crossed his arms to further drive his point.

"I don't want to see you moping around the house anymore. And I've always wanted to go to the Doctor Who Convention for once in my life. Since you needed to get some air, too, what's the reason not to come here? It's a win-win situation."

"A win-win situation? What would I get from coming to this place? I can always get some air in the park. That's what parks are for."

"And what would have happened if we had done just that? You would have complained nonstop that Mycroft's underlings couldn't even hide their presence properly. Again. Just like the last time. Now, in here, since it is pretty crowded, Mycroft's man wouldn't be able to follow you too closely."

John's stance painted the very picture of stubbornness. His navy-blue eyes were blazing oddly, and Sherlock had seen him like this only once before. It was when the detective starved himself for four days and was swaying dangerously. John had literally shoved pieces of bread down his throat that day. At that terrible and mortifying memory, Sherlock wisely decided to shut his mouth.

After that, things went smoothly, unexpectedly so. There was no cry of boredom from Sherlock, and no criminals were threatening them. John could enjoy the convention just like ordinary people mingling around them. John wandered around the building, and was feeling a bit nostalgic as he thought of his childhood with the Doctor. On the other hand, Sherlock, who was walking beside him, showed no interest. He was only absolved in playing with his smart phone. Since John never expected his flatmate to be interested in that 'useless TV show', he didn't even try to sway Sherlock's mind.

Oddly enough, it was Daleks that caught Sherlock's attention. 'Why did they put those giant pepper shakers in here?' was Sherlock's exact question, but still. John explained that they were Doctor's archenemy, and Sherlock nodded his head as if he understood something. John decided to pretend not to hear Sherlock muttering 'hmm, an archenemy, it certainly is shaped like Mycroft'.

They came to the corridor in which the past Doctor's pictures were hung on the wall, and John was oddly reminded of Sherlock when he saw the 11th Doctor.

That was when he heard this; "So, we meet again, Sherlock Holmes."

It was something that villains from B movies would say. Honestly, was it too much to ask for a one, peaceful day? Feeling his shoulders stiffening with tension, John slowly turned around.

AN: Yay, my first crossover fic! Well, I just love both Big Bang Theory & BBC Sherlock, and decided to show my love in this way. Hope you guys liked it!