Finding humor in a strange situation

Usually when something less than pleasant happens the normal reaction is one of two. You help that person, or you laugh at that dork for doing something stupid, then help them. Have you ever seen a movie where in the middle of an tense situation and someone just busts out laughing? That happened in the new Avengers movie but if you think with a twist you'll be able to see the humor in anything, even dark, strange situation.