Bill Burr said he did not appreciate Howie Mandel surprising him with Billy Corgan after the guitarist suggested they could be half-brothers.

The comedian reacted to the forced encounter by shaking the Smashing Pumpkins frontman's hand while telling Mandel, "You're an a**hole."

Bill Burr was not happy with Howie Mandel after his interview was crashed with a surprise appearance by Smashing Pumpkins lead singer Billy Corgan.

Burr said his father was a "piece of s---," as he explained of his tension with Corgan, "It's not that I don't like him, it reminds me of all of that s---."

Bill Burr then accused Howie of bringing Billy Corgan onto the show "for the fucking ratings." "He's bringing you in here, not because he's trying to heal the bullshit that we wen

The comedian, 56, unloaded on Mandel, 69, after Smashing Pumpkins singer, Billy Corgan, 57, showed up mid-interview on the Jan. 21 episode of “ Howie Mandel Does Stuff .” “You’re an a–hole,” Burr told Mandel.