Adam Levine almost lost his cool after one lunatic did something very, very stupid

Pop star Adam Levine was left with a faceful of sugar Wednesday on the set of Jimmy Kimmel Live!

Levine was signing autographs for waiting fans when someone hurled a bag of powdered sugar at his face, covering his torso and half his head.

“It looked like he wanted to fight the guy,” a bystander told E!

“I think this guy had it planned. It was a brown bag with tape around it, which was weird. I just saw powder everywhere. It was just so quick.”

The man was quickly tackled by security and later arrested.

His name has not been released.