There's a theory that says you can't travel in past before the time machine you're using was actually invented.
Yes, but that also means the second you invent a time machine, that fucker is turning itself on and all manner of ungodly shit will come flying through from the future.
And that's the reason why we shouldn't try to invent it.
But then it was never invented so you have nothing to worry about by inventing it.
But also if you invent it, then it was destroyed, how would anything from the future come back to kill you.
That would be a good film plot imo.
It needs to be built somewhere hard to get to, lots of security and stuff, like Antarctica, or dark side of the moon.
My favorite is the theory that if time travel is ever invented then it always existed.
Who told you I can't travel back in time?
You Kent.
Future me told that to you? He must be right.
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