Pretty simple and possibly funny, I think.

All you do is have a conversation with anyone over text, im, facebook, etc. but ALL you can do is talk like one Pokemon the whole time. You can't be meowth, or one of those new-age psychic pokemans that know english. Keep it up until the conversational partner no longer responds.

Here's one I did (not that funny, but a good example):

Bass: what's up
Me: pika chi!
Bass: um ok
Bass: hello
Me: pika pikaaaaaa
Bass: dude what the heck
Me: pika pi? pika chu! Pi! Pikaaaaa
Bass: um ok pikachu
Bass: so what's up
Me: Piiii... Kaaaa...

He could no longer respond, because I used thunderbolt on him.

Your turn!