I love my clipless pedals but I did have the inaugural fall not long after I started using them.
I was climbing a hill, creeping by the time I got near the top, when I turned my head to say something to friends about making it to the top, threw off my weight balance and just tipped over to the side. It all seemed like it was in slow motion but I had no chance to clip out. Not hurt just scraped up a bit.

Glad you're OK, DDH!

Gypsy