After Tiger unsuccessfully tried to stop dragging his image through the turf with his creepy Nike commercial, the Internet could not help but parody it. Since it only involves a voice and terrified-looking Tiger, making a parody is as easy as finding a ominous voice-over.
From Morgan Freeman's rehabilitation speech in The Shawshank Redemption to Heath Ledger talking as the Joker in The Dark Knight to Alec Baldwin's infamous voicemail for his daughter, they are all pretty amazing. But my favorite is set to a '50s sex-ed video talking about venereal disease. Instead of showing just the Nike sign at the end, it adds "Just don't overdo it."