In one of the best-known celeb pranks, back in 2008 comedienne Sarah Silverman went on her then-boyfriend's show 'Jimmy Kimmel Live!' to tell him a secret. A surprise, if you will, of epic proportions.

On the program, Silverman instructs the crew to roll the clip she brought, in which she sings a song about how she's cheating on Jimmy with his nemesis Matt Damon.

The song is unsurprisingly called 'I'm F---ing Matt Damon' -- and features the man himself singing along.

The Emmy Award-winning ditty was just another joke in a long string revolving around Kimmel bumping Damon from his show on a regular basis. The ongoing prank finally culminated in Matt taking his revenge by kidnapping Jimmy and taking over an entire episode of his program. It was perfection.