I map 'jk' in Insert mode to <Esc>. In Insert mode, it takes me out to Normal mode. If I'm already in Normal mode, it simply moves down a line and right back up

I map 'jk' in Insert mode to <Esc>. In Insert mode, it takes me out to Normal mode. If I'm already in Normal mode, it simply moves down a line and right back up. This habit is so burned into my muscle memory that I often end up typing 'jk' into non-Vim input areas (like this HN comment box).jk