Stargate: Atlantis isn't mine. If it was, I would have them run more than the six seasons we were promised, and the five we got. Thank you and don't forget to review.

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Sheppard walked quickly down the corridor. He was upset. Weir, Ronon, Cadman, Kavanaugh, Carson, even his second in command, Evan Lorne, were all in on it. He didn't know who else might be involved. He wasn't going to let that stop him. He wanted to know who was next, who was involved! He was going to stop the Prankster no matter what it took!

"Colonel!"

He could hear Zelenka calling out to him. He didn't stop walking. He other man ran up to him. "Not now, Zelenka!"

"Jeho spodní prádlo musí být příliš těsný!" He heard the scientist say before he walked away.

Sheppard decided that he needed to learn Czech. Zelenka would talk in Czech, and seemed to delight in the fact that no one knew what he said. He headed to Teyla's quarters. He wanted her help.

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He arrived at her door. He didn't know why he felt so nervous, but he was. He hit the chime, but received no answer. He hit it again. "Teyla!"

"Has the prankster been caught?"

When Sheppard didn't respond, Teyla knew what the answer was.

"When you have caught the person, then I will come out, not until."

John knew that she wouldn't discuss it, but thought it would be worth a try. "I need your help to catch the person."

"No! I told you John Sheppard that I will not leave until they have been caught!"

"But Teyla..."

"No means no, John. Now go away!"

Sheppard knew that she wasn't coming out. He turned and walked away.

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He knew that he had to catch the person in charge, or the pranks wouldn't stop. He figured that you had to fight fire with fire, so he set up a prank of his own.

He headed to a storage room and went through everything there. He found most of what he needed and headed to another storage room to get the last part.

He went in and grabbed the list off the wall of what was where. What he was looking for was at the back of the room. It was a tank of laughing gas. The prankster was not the only one who knew how to set up a prank. John just needed a location. So, he started walking.

He didn't have to walk far before he found a corridor what had an access panel and a sharp turn. In a panel on the far end of the corridor, he set the canister of laughing gas and hooked it into a trigger. The trigger was a thin wire that ran across the corridor. If someone hit the wire, the gas would go off, and leave the person (hopefully the prankster) a laughing mess on the floor.

He just needed someone to set it off. He didn't want to call someone down, so he sat and waited. Just as he was a bout to give up hope, he heard footsteps coming. He hid and waited to see who it was.

As the steps got closer, John looked. It was Zelenka! John leaned back against the wall. He could hear Radek walking up the corridor. After a few minutes, Sheppard could hear a hissing sound. He pulled his gas mask out and put it on.

Time seemed to crawl. Just as John was ready to go out and check on Radek, he heard a snicker. That turned into a laugh. The laughter continued and got louder and louder. Sheppard crawled out and saw Radek rolling around on the floor, his face red. What surprised John was that Radek wasn't alone.

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Until next time everyone!

Translation: His underwear must be on too tight!