Manny Pacquiao faces off against Floyd Mayweather on May 2nd in a fight that many have wanted for years. Last night, the heavy hitting boxer was on Jimmy Kimmel with calm sort, Dr. Phil. 

Naturally, Jimmy Kimmel takes the piss out of Dr. Phil a little at the start, then goes back stage to visit in on a session between him and Pacquiao - who offers a very good reason as to why he fights.