Just watched Faster the other day. Actually really liked it, particularly for Dwayne "The Rock" Johnson's badass character.
After watching it, I got an idea for a sequel/spin-off of both that movie and Fast Five, calling it Faster & Furious. The Rock's cop character in Fast Five could be sent to hunt down his Driver character in Faster. The Rock would, of course, play both roles and when they meet up, they discover they are long-lost twin brothers. Then, in a plot twist, we could learn that Cop Rock wasn't actually hunting down Driver Rock. He was hunting down their other brother (that's right, they're triplets), an evil drug dealer, also played by The Rock. So in the end, Cop Rock and Driver Rock would face off against Bad Rock.
Sure, it would be stupid as f**k but after seeing Van Damme play twins multiple times and Arnold play various clones and/or evil versions of himself here and there, why not let The Rock do it too?