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I would go back in time and change things, I suppose.

However, there is a horror genre now, it seems, where someone travels back in time, changes some bad thing that happened, but when they get back to their own time, things are much worse, in some way, so he goes back again, to correct that mistake, but, you guessed it – each time he gets back things are even much worse, so that he is compelled to go back, etc.