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Kanye West declared himself "the greatest living rock star on the planet" at Britain's Glastonbury festival. But that didn't prevent a prankster from invading the rapper's performance and upstaging him. West's headline set last night was briefly interrupted when comedian Lee Nelson stormed onto the stage, rapping along with the star. A security guard quickly bundled him offstage. Later, Nelson—whose real name is Simon Brodkin—tweeted: "Some people were saying Kanye shouldn't headline Glastonbury so I thought I'd give him a hand."

It wasn't the only amusing thing about West's set, which presented a problem for the BBC's subtitles team because of his often expletive-laden lyrics. Many on Twitter shared the comic wordplay that appeared on their screens in place of offensive words—including one subtitle that simply read: "He raps." (West, of course, knows all about stage invasions.)