<div style='font: 11pt "EngraversGothic BT", "Copperplate Gothic Light"; text-align: left; '>Actually, that goes for just about any movie/series. That's the main reasons why I didn't like Sliders. Okay, first of all, if you do ANYTHING back in time, you are going to COMPLETELY change the timeline. If you go back in time five years and sneeze, then go forward to present, anything and everything could have changed. Nevermind the fact that the further back you go in time, the more drastic the changes. Go back to the dino period and sneeze, and you'd end up killing the human race.
Also, screenwriters loooove to pull these time paradoxes on you with the circular time loop thing. The timeline is not ONE timeline! For god's sake, it's an infinate number of timelines. If you shoot your grandfather, you're not going to just disappear. Instead, the current you will stay there (since you're from a timeline where your grandfather <u>wasn't</u> shot), and the you from the timeline you're currently in will not exist (since you just shot "his" grandfather). if you go back five minutes, and stop yourself from going into the time machine, you're be just fine, except there will be two of you.</div>
Rosalina: But you didn't.
Robert: But I DON'T.
Rosalina: You sure that's right?
Robert: I was going to HAVE told you they'd come?
Rosalina: No.
Robert: The subjunctive?
Rosalina: That's not the subjunctive.
Robert: I don't think the syntax has been invented yet.
Rosalina: It would have had to have had been.
Robert: Had to have...had...been? That can't be right.