Scary Movie (2000)
While the stinger on Scary Movie calls back previous jokes involving the mentally handicapped cop Doofy and a vacuum, the moment plays more like a scene from a lost Harmony Korine film. Somehow watching a guy be impaled through a glory hole is less disturbing than this PG-rated sequence.
Pirates of the Caribbean: The Curse of the Black Pearl (2003)
The scene that plays at the end of POTC: The Curse of the Black Pearl is not just a sequel tease, but a false sequel tease. How kick ass would a movie about Jack Sparrow fighting monkey zombies have been!? Very. But instead, we got whatever happens in POTC 2: Whatever It’s Called, one of the more incomprehensible movies ever produced (which had its own bewildering post-credits stinger to match).