Jason: Did you hear about the storm-trooper who attempted suicide?
Dave: No.
Jason: Well, he hit his first target.
Stormtrooper's Suicide Attempt
Explanation
This is an anti-joke that plays on the stereotype of stormtroopers in Star Wars being notoriously bad shots. The punchline is unexpected because it subverts the idea of a joke, offering a literal and somewhat dark statement instead.
Anonymous
Pfft-