The Cookbook to Timetravel
You... You don't know who you are. All you know, is that you woke up, in a room. You don't know what this room is, but you know that for some reason, the air inside irritates your nasal passage. All you know, is that you hold a piece of paper, but you can't read what is written on this paper.
Your mission:
You see that you can't see what is written on the paper, because it is literally not written as a bunch of words in normal human language. It is rather some sort of a scannable code, to be read by a computer. And for some reason, you are conveniently placed in a room that has a computer handy, but also has a scanner on it. So you trot over to the computer slowly.
And discover, that the computer has a password. Great.