I don't own a car or been to a mechanic, so I don't know how car payments work...

The next night, Sheldon was on a train back to L.A. Sheldon wasn't enjoying the ride, he hadn't enjoyed the ride yesterday either. His next door neighbour, Penny, was all he could think about. She had spoiled his buzz about trains. When trains got involved, it was personal; he had to think of revenge.

But there was a tiny insignificant voice in his head that said; if you hadn't insulted Penny and apologised properly, you wouldn't be in this situation.

But that voice was easily destroyed. And Sheldon had the perfect plan for pay back. A plan was all he could think about through the conferences in San Francisco, so it was safe to say that the entire trip was a complete disaster.

Sheldon was sleepy, but he had to do his plan tonight, when she's not expecting it.

"Coffee, sir?" the trolley lady asked with a table on wheels full of snacks and coffee.

"Yes please," Sheldon received the coffee, and took the tiniest of sips.

*

"There's the train, eleven o'clock on the dot," Leonard said to Penny, as they both waited for Sheldon to arrive.

Penny wanted to make peace with Sheldon, before their fight got out of hand.

The first person off the train they saw was Sheldon, but not in the way they expected. They expected to see Sheldon step off the train, suitcase in hand and walked toward to them. But instead they saw; Sheldon leap off the train and land with a spin on his heels, screaming , "WHEEEEEEE!"

He looked around swiftly as if confused, then relaxed and slammed his hand on his forehead,

"WHOOPS! HA I FORGOT MY SUITCASE ON THE TRAIN!!!"

Without care he pushed other passengers getting off aside to get back into the train.

Leonard and Penny looked at each other thinking; uh oh, Sheldon's had coffee!

Sheldon jumped off the train again but with suitcase in hand and yelling, "I CAN'T BELIEVE I FORGOT MY SUITCASE. I HAVE AN EIDETIC MEMORY I'M NOT MEANT TO FORGET. MAYBE CAFFEINE CAUSES AMMNESSIA, BUT FORGETTING MY SUITCASE WOULDN'T BE CLASSED AS – HEY! THIS SUITCASE IS REALLY HEAVY!" Sheldon grabbed the suitcase in both hands and started to spin fast.

Sheldon kept spinning until he heard Leonard scream, "Watch out Sheldon!"

He stopped, lost his balance and made the person behind him and himself land on the ground.

"SORRY!" Sheldon then turned around to see who he landed on, shock flowed through him; making him think he almost had a heart attack, Penny was looking right back at him.

Sheldon jumped off Penny, and Sheldon remembered his task he had to do tonight. The sight of Penny brought Sheldon's hyper-ness to a lower level.

"What are you doing here Penny?" Sheldon asked in a loud voice.

Penny saw him fidget and his eyes blink hard and fast, "I'm here to make peace. We shouldn't jeopardize our friendship, just because we have different opinions. And I'm sorry for making you miss your train, which was stupid of me."

Sheldon blinked harder, but said nothing. He was battling the two voices in his head, whether he should take revenge or not.

Penny took his silence as not accepting her peace, "fine! Let's not stay friends."

She breathed in hard and heaved out, "Come on; let's get out of here, Jerk-Face."

Jerk-face! The vengeful voice won again. The three of them walked silently to the car park, but Sheldon stopped as he saw which car they were taking. Penny's car, this'll be easier than I thought.

Sheldon laughed out loud, and the two turned back to stare at him, and they came to the conclusion that it was the coffee.

*

The car was mainly silent except for humming a tuneless song. He was sitting at the back, because Penny was driving and Leonard had to sit at the front otherwise he gets car sick.

The humming was a noise distraction so that Penny wouldn't notice him searching her bag. He looked through her wallet and found what he wanted; Penny's spare key to the car in case she left her real keys in the car.

He stopped humming and said, "Your check engine light is on penny. You should take it to a mechanics."

"Shut up Sheldon," Penny said, ending the conversation.

*

Back in her own apartment, she looked at her alarm and 11:45 pm. Penny was very tired so she changed into her pyjamas and tucked herself into bed.

Lying there, she shed some tears. I really am stupid Penny thought, I should have just 'knuckled under' like the guys. If I did that I would still have an annoying, rude, germaphobic and perfectionist friend.

She didn't understand why she kept crying.

*

How come she think she's the one to end our friendship, I'm meant to do that, Sheldon thought as he quietly left his apartment at 7:00 in the morning.

He opened Penny's car with her spare key, and slowly drove away from the apartment parking.

*

It was now lunch time and Howard and Raj were over. A serious issue was the topic of conversation, "So...um...I'm going to ask Bernadette to marry me," Howard said nervously.

Raj and Leonard coughed on the food in shock, but Sheldon flatly said,

"About time, you two have been dating for...almost two years."

"Yeah I know Sheldon, I've been counting," Howard responded.

Then the door to their apartment burst open, Penny came through with fear on her face, "My car's been stolen!"

"Oh no Penny that's awful! I'll call the police," Leonard went to the phone.

"That's not necessary Leonard, the car is fine," Sheldon reassured.

Penny narrowed her eyes, "where's my car Sheldon?"

"I drove it to the mechanics, to be fixed," Sheldon calmly stated.

"WHY WOULD DO THAT!?!" Penny yelled.

"So you know what it feels like to be stopped from plans to be somewhere. You stop my train, I stop your car. And also," Sheldon stood up, "The one thing I know you hate is being in dept to someone. I'm paying for your car to be fixed, so knowing you; you'll feel duty-bound to repay me."

"Oh I'll pay you back, Sheldon! But for now," Penny put her right and left index and middle fingers on her temples and stared hard at Sheldon.

Sheldon took a few steps back, and then Penny left.

The tears Penny had shed last night are forgotten.