Yah, I'm bored, so?
Take a minigun with you to the time before firearms, and appoint yourself supreme overload of earth by force
That'd be fun, til you ran outta ammo
Go back to the dark ages with armfuls of technology and make them think your a witch
That's be fun, til they burn you at the stake
Go back to the stone-age, and claim you invented fire
That'd be fun, til you realized no one cared, cause they're not all that bright, they're cavemen
Go back to the dinosaur age with an anti-matter torpedo, and prevent their extinction
That'd be fun, til you killed yourself in the process, how do you launch it?
Go back a few years and kill the inventor of DDR
Kill him with DDR, ah irony
Go forward in time, steal a starship, then come back and fake an alien invasion
Until the government kills you
Go back to when life was just sludge in the ocean, and step in the sludge
I don't think stepping on "sludge" would do that much to it, eating it however.......