Safari auto-completion magic?
Some seconds ago I filled out a form on some website and it had one of those (not really) Turing tests, in this case the question was: “Math question, take (5 - 1) and divide by two”.
To my big surprise, when I entered my name Safari auto completion kicked in, filled out the rest of the fields (telephone etc.) including the test question with “2”!
Probably totally random luck as this auto completion feature is actually quite buggy, I find myself deleting wrongly filled out entries more often than using it, but I was really shocked :-)