Stars love a good laugh, so it's no surprise that they're known to pull a prank or two. In fact, we're still wondering if Joaquin will finally admit he's punking us with his rap career. For April Fools' Day, let's look at some famous pranksters.
While filming "Ocean's Twelve," Brad Pitt created a fake memo from co-star (and serial prankster) George Clooney that instructed the crew to only address him as Mr. Ocean and not to look at him in the eyes. Brad got a laugh, but not for long …
… George Clooney exacted revenge on BFF Brad Pitt by slapping a "small penis onboard" bumper sticker onto Pitt's car. Co-star Matt Damon told VH1, "People were honking at him and waving; he thinks it's because he's Brad Pitt, so he's waving back."
In 2006, jokester (and furry?) John Mayer donned a bear suit during a duet with Sheryl Crow. He later blogged, "This incredible six-week experience will be summed up with just a photograph: Sheryl Crow leaning against a douchebag in a bear suit."
To celebrate the fifth anniversary of then-boyfriend Jimmy Kimmel's show, Sarah Silverman presented her cuckolded partner with a music video detailing her torrid affair with Matt Damon — who had been the butt of Kimmel's sign-off joke for years.
Brit Russell Brand quit his BBC radio show after he and co-host Jonathan Ross left lewd messages on actor Andrew Sachs' voicemail. The duo's recordings drew over 18,000 complaints, including a reprimand from Prime Minister Gordon Brown. Epic fail!
Ashton Kutcher made a living pranking celeb pals on his show "Punk'd" for four seasons. From Justin Timberlake to Kanye West to Mandy Moore, no star was safe. We're guessing Hollywood let out a collective sigh of relief when the series ended.
Sacha Baron Cohen's characters Ali G, Borat, and Bruno wreak havoc on unsuspecting interview subjects, and we likey! The success of both Ali G and Borat forced Cohen to retire those characters, but Bruno's shenanigans are due to hit theaters in May.
Prankster Zac Efron crossed the cast and crew of "High School Musical 3" one too many times. The group got their revenge by tee-peeing the heartthrob's trailer and ambushing him with water guns. The elaborate plan left Efron soaked and shirtless.
In CBS' April Fools' Day special, "I Get That A Lot", celebs prank people by pretending to work regular jobs and denying their identities. One preview shows Jessica Simpson "working" as a geeky computer technician. Fire up those DVRs!
The hooligan cast of "Jackass" spent most of their time subjecting themselves to gross gags and dangerous stunts, but the boys were a hit. They took practical jokes to the XXXtreme and shocked out our laughter, usually living up to their namesake.
In 2008, Jewel punked fellow country crooner Brad Paisley by having him arrested at the Nashville Airport. The faux fuzz cited charges against him "in the states of Texas and Tennessee for excessive noodling." He was guilty as charged.