This post is not funny, mainly because I'm explaining what makes things funny (and that usually kills it).
In improvisational scenes there are usually 4 options:
1. Unusual characters in unusual situations.
2. Normal characters in normal situations.
3. Unusual characters in normal situations.
4. Normal characters in unusual situations.
Which do you think usually make for funny? If you guessed 3 & 4, you'd be correct.
Abnormality in and of itself does not do much to make people laugh. Something abnormal has to be juxtoposed next to something normal in order to resonate with people. Let's see how this works.
1. Unusual characters in unusual situations. Not usually funny, usually surreal. Unless you're Salvador Dali or Stanley Kubrick--and your audience is expecting something avante garde, this is not the best choice. Think about it--unusual characters are unusual enough to be funny, so when you put them in an unusual situation--it almost makes the scene more normal!
2. Normal characters in normal situations. Some improv troupes emphasize reality--show the truth about the world. I agree, good concept. But, in theater--often the only way to show how something is normal or abnormal--is by showing its opposite. So, normal characters in a normal situation might be a great journal entry, but probably not something that will be remembered.
3. Unusual characters in normal situations. This is bread and butter of lots of comedy. Think up a strange character--like Mr. Bean, anyone from Mad TV, Leslie Nielson, etc.--and put them in a normal situation, and watch others react.
Key for doing this well is having a comedic foil, aka the straight man. Too many unusual characters, and you've got an acid trip, not comedy. But, have normal people reacting to unusual people--and, you've got something funny.
4. Normal characters in unusual situations. This one is harder to invent, but can be smart comedy. Why would normal people be in such a strange situation? That's the fun. Often with improv where audiences provide the suggestions, the situations are naturally bizarre and off the wall.
Often, playing characters straight heightens the tension, the abnormality of life--and results in comedy. And, when the situation is unusual, allowing characters to react in unusual ways heightens the tension with what the audience expects.
Well, now that I've sucked the life out of comedic scenes by analysis, hope you have a great day.