Advice on writing surreal/random humor

Title is self-explanatory.

How does one do random or surreal humor well, and what separates good examples of it from bad?

For the love of J.R. Bob Dobbs, don't try too hard. That will spell the failure of any work relying on randomness.

Also, I've found that Surreal Humor, like all humor, usually has to make sense on some level in order for it to work.*

Even the most random comedy series, Aqua Teen Hunger Force and FLCL, for example, rationlize the jokes by setting up a universe in which those kinds of things are expected.

edited 1st Dec '13 9:54:51 PM by Wheezy

Thanks for the advice, folks, but I am also wondering what separates good surreal/random humor from the bad kind...

Like Wheezy said, I think that surreal humour has to have some kind of subtle logical underpinning to make it work, but how that logic works is important to keep in mind. A dream makes sense when you are having it, and the justifications make sense in an associative or abstract way, but applying that kind of logic in reality is absurd. This is what makes surrealistic humour funny—and, on the other side of the coin, something like Franz Kafka's "A Country Doctor" utterly horrific (yet also funny).