Some of the funniest clean, short jokes, in question and answer format, are "Q: What did the duck say when he bought lipstick? A: Put it on my bill!" and "Q: What do you call a fake noodle? A: An impasta!" How funny a joke is, however, is always subjective.
Short, clean jokes are good for telling at work or parties, as they do not offend anyone and usually get a cheap laugh out of whoever they are told to. This especially applies when around co-workers or young children, where it may be unwise to say something that could be inappropriate. The humor of short, clean jokes is also easy to understand, guaranteeing that they reach as much of the audience as possible.
Some people, however, may just groan at the joke due to the fact that they can be a bit generic or corny. Others, who like their jokes to be edgier or more complex, may be bored by them. Like all jokes, how funny the audience finds them is ultimately subject to each person's interpretation and sense of humor. Generally though, whether it be to one person or to a group of people, a person can never go wrong when telling a short, clean joke.