I was typing a reply, and my fingers got tangled up, resulting in my hitting a couple of keys at once. Immediately thereafter my unfinished post got submitted.
I always submit by dragging my cursor and clicking on submit. This time, my hands did not leave my keyboard.
Is there a keyboard shortcut to submit? Just curious.
The Submit button has the “accesskey” attribute set to S. If Alt-S doesn’t work for you, try finding out how your browser uses access keys. (A list for a few major browsers.)