Occasionally when I try to quit Vim, I get something that looks like this:

I'm not sure how I accidentally invoke this, but my current method for escaping it is to hit random keys and eventually it goes away. Two questions:
- How am I invoking it (I use
:qto exit vim) accidentally, and - How can I exit it quickly and get back to what I'm working on?
map q: <Nop>in ~/.vimrc, as I find it very irritating, and never really use it. – Andrew Ferrier Feb 05 '15 at 21:21map q: :q, which is probably even better. – Wolfie Oct 06 '16 at 20:52