Pretty Good Joke

Tom, Bob, and Steve were all on their way to Guiness' World Records. 

Tom said, "I have the smallest head in the world!  I'm going to beat the record!"

Bob said, "I have the smallest arm in the world!" 

Steve said, "I have the smallest penis in the world; I'm going to beat the record!" 

After going in to claim the new world records...  They came out and talked about their success. 

Tom, "Man!  I beat the record; I have the smallest head in the world!" 

Bob, "Awesome!  I have the smallest arm in the world!" 

Steve, with an angry look, "Who the HELL is Justin Beiber?!"