Holy crap, I am full of fail!
The boat/island scenes in the credits for the most recent Dawn of the Dead remake - the opening bits were also good.
Some of the Pixar movies have done fake outtakes over the end credits. Monsters Inc and Toy Story 2 did, maybe others as well. For example one scene in Monsters Inc is a parody of The Right Stuff, where a line of monsters walk in slow motion. Over the end credits they showed the outtake where in slow motion the line walks, one stumbles, and the rest fall like dominoes.
In addition to the fake outtakes, Monsters Inc had the company play “put that thing back where it came from or so help me” over the end credits
The end credits for Cars feature John Ratzenberger (Mack the Truck) watching scenes from fake “car versions” of Pixar films, praising the very real performances of Hamm the Piggy Bank in Toy Story (John Ratzenberger), P.T. Flea in A Bug’s Life (John Ratzenberger), and The Abominable Snowman in Monsters, Inc (John Ratzenberger). He then realizes, “They’re just using the same actor over and over. What kind of cut-rate production is this?”
Were the end credits running in the final scene of Apocalypse Now with napalm exploding everywhere and The Doors playing “This Is the End”?
I remember watching it once in a theater where someone thought it a good idea to draw the curtains on this scene. She or he was “coaxed” into reopening them.
This may be the only time I prefer the framing device (and the brilliant climactic sequence bringing together all the various stories) to any of the stories themselves.
I love the end credits of Scrooged - with Bill Murray talking to the audience during the singalong of Put a Little Love in Your Heart. Just the women, just the men - then points out the guy who was talking all during the movie… Cracks me up!