Ashton Kutcher from Punk'd and Two and a Half Men, has pranked hundreds of celebs, but one of his best was pulled on Justin Timberlake

An agent from the 
tax office showed up at JT's place, telling him he owed the government a million bucks!

"Justin almost cried," laughed Ashton.

Want more lolarious pranks? Click the link to buy the 
K-Zone Prankster's Handbook!