1 Charity Collector Guy: The first step is we need to get to the time when Hitler was wounded. 1933, at the Reichstag Fire.
2 Yeti: There are some Nazi science teleport booths over here. I can modify them to send us back in time.
3 Terry: Wait, the Nazis had developed teleportation??
4 Yeti: Don't they teach you humans anything in history class?

I know my history classes at school glossed over this point.

Of course I didn't pay much attention to history at school. It was easily my least favourite subject. So it was surprising to me when I discovered, years later, that history could actually be interesting. I realised the reason I hated history so much at school was that all my history teachers sucked. Because of that, I lost maybe a decade of interest in history. It's a damning indictment of just how badly a poor teacher can affect someone's natural interest in something.