Re: No context
You know, actually, if you were to come up with the ability to go back in time, you could really have some fun by going back in time, killing, say, Andrew Jackson, then going forward well past any human lifetime and getting yourself thrown in jail for assassinating a president over 100 years prior. (Well, I say "fun". You'd be stuck in jail for assassinating a president. But it would make a fun story in a history book.)