Seeing as how today is Back to the Future day it only seems right that we take a look at the moments we all wish we could change. There's an interesting scene in Knocked Up where the main characters discuss what they would change about their lives if Doc Brown showed up in the Delorean and gave them that chance. It's very nice and P.C. to say you wouldn't change anything because you like who you are and who knows what changing one little thing would do to you. Maybe if you went back and dumped that crazy ex before things went off the rails you wouldn't have met your spouse and instead met a person crazier than your ex.