Aikido as well. I slipped getting out of the shower not too long ago and instinctively tucked my chin.

Another time more recently I was dashing up some concrete steps with a DSLR in my hands in front of me. My toe caught a step just as I hit the landing. I was headed towards a face first fall with the DSLR between me and the concrete. Instead I instinctively turned, rolled onto my back, and sprang back to my feet.