Break the radio, and say that while everyone was sleeping there was a nuclear battle and now everyone on Earth is dead.
Look out the window any scream “We’re being boarded!!”
Uncouple the Japanese section, and as they float away helplessly yell “That’s for Pearl Harbor!!”
Use the Canada arm to start punching the Russian space shuttle and then exclaim that “they were asking for it with all their freakin’ late-night cooking smells”
Flush a crew member out the air lock and tell everyone he was an alien planning to kill everyone and that you saved them from being cocooned!
Lock someone outside and tell him you won’t let them in until he guesses the right number between one and a million. Then tell him you were only kidding and testing his resilience under pressure, and let him in just before his air runs out.
Dump a bottle of Vodka in the Russian’s space suit, smash him over the head with his space hat, and as he reels about, point at him and exclaim to everyone: “Hey, look at Euvonnamokinov, he’s drunk in space! Lock him in the ejection pod till we return!”
Instead of bringing your experiments on board, smuggle in a hooker!
When docking the shuttle, start beating the Viking war drum you hid by the controls and yell “RAMMING SPEED”
Image used under a Collective Commons License from: https://commons.wikimedia.org/wiki/File:International_Space_Station_after_undocking_of_STS-132.jpg