Someone who makes other people laugh. Very often muppets hang around with other muppets, creating flocks. They are recognized by their strange behaviour and loud laughter.
Warning! Acting like a muppet might make people think you're retarded. But that is sort of fun.
Muppet: You laugh at silly things and burst into strange songs for no apparent reason accompanied by equally strange dancemoves.
Muppetdancing: You listen to a song (or make one up yourself) and start moving. You don't care if anyone laugh at you.
It might look ugly, but it's fun! (See FUN in UD.)