Taken it before. Hitler. Though I honestly think that "your/you're" is a grammar error much more than a spelling error; it shows a lack of understanding of the language, not that you couldn't remember the precise sequence of letters. Same sort of thing with "its/it's", but vaguely less so, since the rule is somewhat arbitrary. Also, there's one question that explicitly asks about punctuation, which is certainly not spelling (except possibly for contractional apostrophes).

I also find it funny that the Hitler image's text contains a spelling error.