Using context effects in comedy is an old and effective tact, especially if one works in slapstick. A trickster needs to not only get someone to walk into a gag, he needs to make it comical.
If you take a man in a tuxedo and trick him into looking silly, it will be funnier than tricking a person wearing ordinary clothes.
The common clown car trick is a prime example. You see a small car and it has way more clowns in it than you expect. It's funny because you don't expect it to happen because of past experience.