you know that if you go into the future, you will immediatly be stricken with 26th century viruses which will kill you straight away, because your immune system isn't ready for them. On the other hand, you go back in time, you give everyone 21st century viruses, which for them are worse than the black death.
Well, it says on my profile where i'd like to be. either that or some sort of pirate sailing on a big black clipper ship, sailing from this land here to that...
People fantasize about stuff like that because they think that they live in a shit decade. unfortunately, all decades/eras are shit, or great, depending on whether you are of optimistic or pessimistic persuasion.