Humor
Leaving out details in order to create humor can work two ways.
Often, people will omit words from their speech, assuming things are concise, when they are, in fact, ridiculously vague and easily misinterpreted. For instance, answering ‘yes’ to ‘Do you mind?’ Easily misinterpreted, easy to act upon, and even easier to create a new set of dialog that can still result in confusion.
Example: Who’s on first (either version)
Another way to use humor is to actual leave in only the punch line. This is a very difficult skill to learn, but is one of the most effective ways to make your readers laugh. The best explanation would be to list the examples first and go from there:
arrow Examples: Venture Brothers, Malcolm in the Middle
The second season of Venture Brothers really drives this technique home. From an entire episode that shows carious scenes involving use of a time machine that shows only random crazy scenes leaving the reader wondering how such weirdness could possibly have been set up, to the very last bit of the show where Dr. Girlfriend says “I’m …” and thus shocking the hell out of her husband. The audience is left with no clue in that episode as to what she said to elicit such a response and no more information is given.
One scene in Malcolm in the Middle managed to be one of the best examples of this technique. Not only do we not see what the children are talking about, but we do not see them at all. We are show the parents attempting to sleep through sounds of crashing, banging, and finally they hear one child saying ‘blood tastes funny’ through the wall. As the two fight over who should get up and see what the disaster is, they hear ‘Leave the squirrel alone and get the fire extinguisher.’ And that is the end of the scene and no more is mentioned or hinted at it.
Al the audience if ever given in these scenes is the punch line: a vague mention of a disaster or a brief scene, either of which are hard to conceive of how such things could come about and in leaving the audience to wonder, they either fill in the gaps or laugh at the missing pieces.