Physical comedy generally comes in one of five forms, which all overlap:
#1 Slapstick: People hurting each other/Hurting themselves.
#2 Silliness: People doing unusual things, such as ‘The Ministry of Silly Walks’ sketch from Monty Python, or making a silly face.
#3 Costume/Prop: Using costumes or props to derive humour.
#4 Curiosity: Being amused by other people’s differences. (this one is debatable as a form of comedy)
#5 Anthropomorphism: Giving animals human characteristics.