Humor And Situational Irony

    There are three basic types of irony: dramatic, verbal, and situational. Most people know what all of those are. All of them can be really useful tools in adding humor to a story. Today I'd like to talk a little bit about ways I've noticed that situational irony has been used.
    Situational irony is basically when something totally unexpected happens that neither the characters nor the readers foresaw. "Didn't see that coming!" That kind of thing. This might be the most powerful irony tool used to make people laugh--when not used too often, it can cause readers/viewers to burst out laughing rather than just chuckle.
    There's more than one way to be ironic. The situational irony action/event could be uniquely comical (like a duck randomly landing on a guy's head and trying to eat his hair) or it could be a "natural", every-day thing (like having another character--bonus points if he/she's annoying!--waltz in and naively spoil a special moment between a budding couple). It could be something huge that throws the whole scene into a tailspin, or it could just be a disruption that creates an "awkward silence" moment.
    A well-set mood tends to be important. Usually the mood of the scene is serious, or something important is about to happen, or characters are pondering large decisions. The scene's set for seriousness, or suspense, or another kind of tension . . . then wham! Something unexpected happens that knocks the character off their feet, or at least jolts them. And the action is timed just right to make it hilarious to witness.
    A really popular show that uses situational irony well is Sherlock (you might have heard about it), mainly in the main character's behavior. In the series, Sherlock's attitude and the way he acts is so contrary to normalcy and the expected that most of the other characters think he's crazy. But the viewers love it! It's what makes the character memorable and the show naturally funny.
    Do you know any other examples of books or shows that use situational irony like a pro?