Oh, did something similar to change a friend's grades in college. Pretended to be on my smartphone while the professor signed in, and filmed their fingers on th

Oh, did something similar to change a friend's grades in college. Pretended to be on my smartphone while the professor signed in, and filmed their fingers on the keyboard. Took some trial and error watching the low-res video (this was before phones had nice cameras) frame by frame to figure out which keys he was hitting.