Re: No story to share, but...
I have made a similar mistake - and sat there with my finger holding the button in while then shutting the machine down tidily with the other hand.
Reminds me of a story from the Vietnam War. A soldier heard a click as he put his foot down. He had the presence of mind to stand still until the landmine could be excavated and neutralised. It was designed to explode when the triggering weight was lifted.