I think I would go back into various time periods and kidnap famous historical figures. People like Napoleon, Genghis Khan, Billy the Kid, Abe Lincoln, Beethoven, Freud, Joan of Arc... I would then bring them back into my time and use them to do a most excellent history report at San Dimas High to ensure my friend Ted did not have to go to military school. We would then use the music of our band, the Wyld Stallyns, to unite the world.
Actually, I saw a movie about something like this once... I think it was called "The Two Guys Who Had A Time Machine".