Sight gags

I'm interested in hearing what sight gags you use, have used, or seen. Thinking along the lines or parade gags. Lol, the first one I recall seeing, was a guy carrying a suitcase/briefcase that said "Rock n Roll" on the outside. And of course inside was a literal rock, and a roll of toilet paper.

I've got a small clown bike collection, and I'm thinking of displaying it, along with some fun sight gags such as the "Rock n Roll". So looking for ideas, suggestions and inspiration. Thank you in advance.