Green Day's Billie Joe Armstrong slams Justin Bieber in profanity-laden fit at iHeartRadio

Make a note: Don't make Green Day frontman Billie Joe Armstrong angry.

At the iHeartRadio festival in Las Vegas this weekend, Green Day's set was cut short to make room for more pop-friendly acts (like Usher, whose set ran 25 minutes long) -- and Armstrong was pretty peeved about it, to put things lightly.

Realizing his time was running low, Armstrong stopped his band in the middle of a song to play a new tune -- and then he realized that he didn't even have enough time on the clock for the new material. So he ranted.

"I'm not f***ing Justin Bieber, you motherf***ers," he raged, dropping over twenty F-bombs over the course of a minute and a half before destroying his guitar on stage. "We'll be back!" he promised (warned?) as the band left the stage.

Watch the outburst below, but remember -- lots of profanity, so you might want to ask your children, grandmother, and/or delicate-minded pet iguana to leave the room.