First off, I would pwn one with a crowbar. Then one approaches me and says "We come in peace" After this event I say "hey since you guys are so peaceful,can I have 20 bucks??" They say "sure", give me 20 bucks, and leave.
I have no idea. maybe i'd come to one, poke it, and say "i poked you, MUAHHAHAHAHAHA" and then we'd all be happy. and weird, because it would fit the thread
give them a PS2 and 'destroy all humans' with a vr helmet. they think they've destroyed the world-we outsmart them. then we can put them in the LHC an watch as they scream and disintergrate and...well...die. (8o)<-< ::::<{==#]-
I would try to find the female aliens, and have hot steamy alien sex with them, and when I'm done, I'll brag to everybody, and say, "How many of you can truthfully say that you banged an alien?"