If you've ever read the XKCD webcomic, i'm guessing you've red the "My hobby" issues.
Here are some examples:
http://xkcd.com/437/
http://xkcd.com/259/
http://xkcd.com/331/

Now, make your own! I'll start.

My Hobby: Going out on ridiculously cold days and watching my spit go "clunk".

Hahahaha the 3rd one was hilarious.

Umm...I guess..

My hobby: I play toribash and tell everyone that i actually have a life.

Here's another example

http://xkcd.com/296/

my hobby: replying to threads in wibbles

Oh cool a shitty thread, we need more of these.

Oh, cool, another bastard who thinks he's the best man in the world. we DEFIANTLY need more of these.