It's all fun and games until the gunmen show up.

Alt-J's second "Left Hand Free" video keeps that old adage alive with plenty of poolside bloodshed. The clip spends a couple minutes on slow-motion views of attractive young people sunbathing, making out, spraying champagne, etc. before it gets weird.

We won't ruin the surprise, but that helicopter is bad news.

Alt-J are quickly becoming one of the most popular groups in the universe, but they haven't reached the stage where people actually recognize them.

"It's wonderful to maintain some personal anonymity," keyboardist Gus Unger-Hamilton told the Irish Mirror in September. "And we don't have to deal with paparazzi. We can ride buses in London without anyone batting an eyelid and then I'll be playing on the David Letterman Show the next week, so that's pretty cool."

The Leeds group broke onto the scene with 2012's An Awesome Wave, and then followed that with 2014's This Is All Yours, which features the hit single "Left Hand Free."

"The first album seemed to transcend different musical tribes in terms of the people who listened to it," Unger-Hamilton said. "So we realised it was OK to make albums like that - we have a fanbase who trust us. So we thought, 'Let's do the same again'."

The new album came about despite a major snag when founding member Gwil Sainsbury left the group in January.

"We always knew Gwil struggled with the lifestyle of being in a band," Unger-Hamilton said. "So when he turned up and said, 'I'm going to leave', we understood why."

But things are going well. The trio collected the UK's famed Mercury Prize for An Awesome Wave, and have a big fan in Miley Cyrus.

"She mentioned she was a fan of our music on Twitter," Unger-Hamilton said. "Which obviously got us a few thousand more followers.

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