It's the same crew that does the original Ti Quan Leap skit where the original "Boot to the Head" phrase comes from. It's a radio show, and you can tell with some of the lines from both skits. Dr. Demento only found the clip, but somebody else actually wrote it.
Looked it up
here. The correct answer was "The Frantics".
Rosalina: But you didn't.
Robert: But I DON'T.
Rosalina: You sure that's right?
Robert: I was going to HAVE told you they'd come?
Rosalina: No.
Robert: The subjunctive?
Rosalina: That's not the subjunctive.
Robert: I don't think the syntax has been invented yet.
Rosalina: It would have had to have had been.
Robert: Had to have...had...been? That can't be right.