Random quote from a Fox News article:

During some videotaped commentary about the Muppets Henson’s longtime collaborator Frank Oz remarked that if Henson didn’t know how to end a skit, he’d do one of two things: one Muppet would eat the other one. Or, one Muppet would blow the other one up.

Not usually on Sesame Street, I would suppose.

Oh, and Jim Henson used to appear on The Ed Sullivan Show.

Source: Fox News

BTW, it seems that Disney (who bought The Muppets a few years ago) is planning a major Muppets Renaissance- complete with The Jonas Brothers and Hannah Montana.