I've got one...but it isn't exactly funny. In fact, it's the exact opposite.
It was an episode of the documentary show 'Forensic Files.' In addition to the Muppets, my all-consuming interests include detective work and forensic science, and FF is one of my favorite shows.
This episode was the story of a little girl who was kidnapped during a Christmas party in 1989 or 1990. To this day, they still haven't found her, but they caught the guy who did it.
The investigators had only a few clues: for example, the girl had been wearing a fancy blue sweater with a Big Bird patch on the front. They tried to find a copy of it to compare with fibers found in the suspect's car, but couldn't...but then the wife of one of the detectives remarked that J.C. Penney was the only store that carried a Sesame Street line of high-end kids' clothes.
Because of that, the detectives were able to get a sample of the sweater and match it up to the fibers. And that's how they caught the guy.
Sad story, yes, but it's nice to know that in a way, the Muppets helped snag a criminal.