Billie Joe Armstrong of Green Day ended a performance in France this week by throwing a guitar — worth over $6,000 — into a pool.

The alternative rock frontman was at the Cannes Lions on Wednesday, June 20, to play at a private party promoted by Live Nation and Citi. Armstrong took the stage with son Joey Armstrong and guitarist Jason White at the event.

Billie Joe Armstrong Performs At Cannes Lions

"Oh, man, that's a rental," a crew from the show was heard saying, reported Page Six. The same person said that the guitar alone costs £5,000 or about $6,623.

This, of course, does not come as a surprise. Rockstars have pretty much created an unspoken tradition of wrecking expensive equipment on-and-off the stage.

At the event, Armstrong also shared some stories about late rock icon Chris Cornell and the time he was kicked out of a Soundgarden concert for stage diving. He also recounted the story of how he met his wife, Adrienne, while touring at the age of 18.

He entertained the audience by performing covers of The Ramones and David Bowie hits as well as some popular Green Day tracks. Page Six revealed that the 46-year-old played "American Idiot," a song from Green Day's seventh studio album of the same title.

Billie Joe Armstrong Slams Donald Trump

At the same event, Armstrong also aired out what he really thinks of U.S. President Donald J. Trump, who is once again under fire for his controversial border policy. The rocker joined dozens of celebrities who have criticized the Republican leader.

"Without getting too political, it's important we look out for each other and show compassion," he said. He was alluding to the border policy that has been separating children from their parents.

"I f****** hate Donald Trump so much," the singer-songwriter added. "I used to scream I hated George Bush. This one is a little different. This one is bad, it's like acid gone bad."

Armstrong is not the only musician to join the conversation around the controversial border policy. "The Boss" Bruce Springsteen also recently commented about the issue during a Springsteen on Broadway show in New York City this week. The 68-year-old called the policy "inhumane and "un-American."

Cher, John Legend, Nicki Minaj, Lin-Manuel Miranda, Sara Bareilles, and many others have also spoken against the issue.

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