http://icanhascheezburger.com/

I must say, this one is pretty funny:

 

 

Speaking of such things, how about this one?

 

http://www.failblog.org

 

WOW! That was awesome! LOL

From failblog.org:

 

Do Not Fold Coins.

 

Looks suspiciously like the Cleveland RTA logo - but JMasek did say their graphic design guy was overworked.  :)