This is Fear on Saturday Night Live. John Belushi lobbied to get them on. To quote the infinite wisdom of Wikipedia:
The band's appearance included a group of moshers, among them Belushi, Ian MacKaye of Minor Threat (and later Fugazi), Harley Flanagan and John Joseph of The Cro-mags, and John Brannon of Negative Approach. The show's director originally wanted to prevent the dancers from participating, so Belushi offered to be in the episode if the dancers were allowed to stay. The end result was the shortening of Fear's appearance on TV. The band first performed "I Don't Care About You." They started their second performance by saying, "It's great to be in New Jersey," drawing boos from SNL's New York live audience. Accompanied by gory footage of blood-filled pumpkins being carved into Jack O'Lanterns, Fear then played "Beef Bologna," "New York's Alright If You Like Saxophones," and started to play "Let's Have a War" when the audio and video of the telecast faded into commercial. During the performance the slamdancers left ripe pumpkin remains on the set and stage speakers. Belushi also offered Fear the soundtrack for his major motion picture Neighbors. The movie studio eventually forced Fear off the project after Belushi's death. Shortly after the 1981 Halloween SNL appearance, which resulted in $20,000 in damages, some clubs chose not to hire the band.