5SOS Admit Themselves Into Reform School In 'Good Girls' Video: Watch

Time to bust out your bad attitude.

Did you know that good girls are bad girls who haven't been caught?

5 Seconds of Summer headed to a reform school on Friday (October 10) with their "Good Girls" video and caused chaos. According to the guys, there's no reversing a bad attitude.

In the beginning, Luke, Michael, Calum and Ashton show up to the principal's office all dressed up (a strange sight for everyone's who's used to their ripped jeans and band Ts) as a string quartet. The guys pull off the part of snooty classical musicians quite well, but you can tell they're up to something.

"A good girl is like sweet lemonade on a hot day," Luke says sarcastically, although the guy hiring them to turn the "bad girls into good girls" has no idea what's about to go down.

Before we know it, there's a rebellion throughout the whole school and 5SOS leads the ladies (ahem, bad girls) outside in a riot, telling off their principal along the way. That's what he gets for having a strange bias against women and wanting them to stay silent!

Watch the video, and let us know what you think, k?