A friend once described absurdism—citing Albert Camus—through the Greek myth of Sisyphus. Sisyphus was punished by being forced to roll an immense boulder up a hill, only to watch it come back to hit him, repeating this action for eternity. In other words, it is the very essence of eternal tragedy and hell. Camus, on the other hand, sees the tragic situation and can't help but laugh at the bizarre predicament. Absurdism is the ability to find strange and off-beat enjoyment out of something horrible or tragic.
This is a list of films that more or less deal with absurdism. All of them have a tendency toward dark comedy, and while very few compare to the others, they are joined by this weird vein of "fucked up"-ness that I just happen to dig.
Alphabetical order. Will be continuously updated.