Well, sorry. I can't resist a crack at it.
There were three guys in a cafe. The first says, "I have the smallest arm in the world!" 
The second says, "I have the smallest head in the world!" The third says "I have the 
smallest richard in the world!" Hours later, the group goes to Guiness. The first and second come out happy. The last, however, comes out pissed, screaming, "WHO THE forget IS JUSTIN BIEBER!?!??!?!?!??!?!!"