A Long Beach, California-based punk band named WACKO threw a hardcore show at a Denny’s in Orange County over the weekend, and the videos are absolutely wild.

Per social media and multiple news outlets like Time, WACKO brought a full house — and a mosh pit — to the Denny’s at 2530 S. Bristol Street in Santa Ana on Saturday night. Videos show the place fully occupied by thrashing fans, some of whom were standing on tables to videotape the set and all the pushing and shoving in the mosh pit. There’s even a wild 20-minute video of the entire set, including a bunch of the punks beforehand hanging out inside the restaurant and getting a meal. (Warning: Coarse language throughout.)

The Instagram hashtag #WackoDennys includes a number of photos from inside the restaurant as well. The show, per some attendeeds, was fully planned in advance and approved by staff at the Orange County Denny’s, though it’s unclear if they were told that a full-on punk show would draw this kind of attention. Per at least one Twitter user in a tweet that has since gone viral, “the manager had no idea what she was getting into.”

Denny’s has since denied that staffers knew the extent of the event, saying:

Denny’s is a family friendly restaurant and while we do have banquet space available at some restaurants, we do not allow events that can disrupt the dining experience of our guests. The manager was unaware a concert was planned, and the event organizers have been asked to pay for damages.

Damage to the restaurant was reportedly north of $1,000, and some folks are using Venmo to pay the band for the stunt.