I often use humor. I often talk about humor. But I don't often stop to think about how great it is to have humor.
Humor can be used to mock, or it can be used to lift up. During Psychology class, we discussed how laughter is often a social tool, and is used to establish superiority over the object of the joke.
So every time someone makes a grimdark joke about death (see: military humor), they are making fun of death. This works especially well for Christians, since Christ defeated death and gave everyone a chance at life.
Speaking of mockery, I like to imagine the outrage that happened when that one demon (it's always that one guy that gets in trouble, I bet) has to awkwardly announce to his boss that, um, the special prisoner kind of escaped, and He took a bunch of the others with Him, err, what do we do now boss?
C.S. Lewis himself seemed a fan of this approach. One of my favorite parts in The Screwtape Letters is when Screwtape is ranting about the "Patient"'s new girlfriend. However, he seems most angry at the idea that she's the type to laugh at him. (Which serves to make us laugh even harder than we were already doing.)
Humor is often what is used to face fears and challenges.
Laughter is a very powerful weapon indeed.
ESPECIALLY WHEN IT IS ONE OF THE ELEMENTS OF HARMONY, OH BOOM, YOU TOTALLY DIDN'T SEE THAT COMING DID YOU?
Props to l0gun on deviantArt