I had a friend send this to me

3 guys are in a cafe
one says: ive got the smallest arm of the world!
another says: ive got the smallest head of the world!
last one says: ive got the smallest dick of the world!
the 3 guys go to Guinness World Records.
first one goes first and returns happy: ive really got the smallest arm in the world!
second returns happy too: ive really got the smallest head of the world!
last one returns angry and screams: WHO THE FUCK IS JUSTIN BIEBER?!