Time travel is probably the most tricky, messy, mind blowingly WTF thing to ever use in Sci-Fi! Any time it comes up I wanna scream! Some examples: Fry is his own grandpa in Futurama! Chibi-Usa is Usagi's daughter from the future in Sailor Moon. Butterfly Effect isn't really traditional time travel, but rather changing events in the past. Anyway, the question! If you were able to go back in time... would you give in to temptation and alter the past? Or would you observe only?