I'd pop back with a camcorder to see Moses, Buddah, Mohammed and Jesus to see which ones were talking out of their hoop. I'll not bother with Joseph Smith and the bloke that started Scientology as I already know the answer. Agincourt as watching the French get beaten like a ginger stepchild never gets old. I'd pop in to tell the Titanic driver he was about to have a very bad day - not because of the value of human life but to stop at least one film with Leonardo De Caprio getting made. The Incas, the Awa maru, the Confederates and Yamashita to see where they burried the loot. Prehistoric time to see how Fred Flintstone got that car made of rocks to move. Oh and I'd drop into the Filming of Behind the Green Door - classic 70's porn. I think the reason is obvious.