We admire celebrities who can laugh at themselves — and take joy in laughing at one another.
That's why, this April Fool's Day, we have rounded up ten of the top celebrity-on-celebrity pranks of all time.
Last year, Conan O'Brien released a parody video saying he had purchased Mashable and was ousting Pete Cashmore as CEO.
Then there's the epic, ongoing prank war between George Clooney and Brad Pitt, not to mention Nicole Richie and Joel McHale's penchant for hacking their famous friends' social media accounts.
10. Conan O'Brien v. Pete Cashmore
Last April Fool's Day, Conan O'Brien posted the below video claiming he had purchased Mashable and ousted Pete Cashmore as CEO.
"You're through Cashmore, through, get out!"
9. Taylor Swift v. Keith Urban
It all started when Taylor Swift tweeted, "Last night on tour with Keith Urban. Pranking is a must. How about rushing his stage during 'Kiss a Girl' dressed like this?"
And she did. That's Swift, barely recognizable in her KISS makeup (left), and on-stage next to Urban (right).
8. Ryan Seacrest v. Joel McHale
The two E! hosts are notorious for jabbing one another on their respective TV shows.
On April Fool's Day in 2010, "The Soup" host took over RyanSeacrest.com, renaming it JoelMcHale.com and imposing his face on Seacrest's body.
Then McHale tweeted from Seacrest's account, "Ryan here: just interviewed @SelenaGomez. She was awesome. Really connected. Psych! It's still Joel! #seacresthacked."
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