My girlfriend knits too, and I think it's a toss up on which one of us curses more. Me when I realize the stupid thing I did which had been eluding me for the past hour, or her when she realizes how many rows she has to undo to get back to the point the incorrect stitch was made. At least I can just highlight, delete or just hit cmd-z. It can take her quite a bit more time to undo.