Hi,
Aside from the insulting laugh track, this is funny.
I think that you have to be in an environment where you are allowed to do some weird/funny/strange things, so that stuff like this comes out.
I used to do dumb stuff in rehearsal ... like run a vacuum cleaner ... and it was somewhat designed to help teach the actors a stronger level of concentration in the work they were doing ... you still have to respond to it, but you don't have to break character ... can you imagine how George and Martha would handle that? Yeah!
The Muppets have a lot of weird stuff in music, and with many of their guests ... Peter Sellers doing a duet about the Gypsies (or something like that) was totally nuts, but it tells you that he really wanted to take them out of their comfort zone ... and that, I think, is the secret.