I don't know if anyone else remembers though little commercials that KTVU used to run when I was growing up in the 1980s. They were two hand puppets, one a horse and the other a bulldog (I think), and they always had a little 30 second morality play about doing the right thing. The one I remember the most is when the dog borrows a lamp without asking and then breaks it by sneezing on it too hard. He then yelps, "I'm gonna need glu, gonna need lotsa glue!"
Anyways, that popped into my head when I read this article about what happened at the Fitzwilliam Museum in Cambridge. I would hate to have been that visitor.