I have this strange mannerism that often catches me off guard. I imagine painful, unlikely events. For example, I used to work with an exacto knife while building architectural models. I would frequently imagine cutting through my finger. It actually happened often enough to consider this a mental fair warning that knives cut. To get to the unlikely part, sometimes I would go overboard and transfer the imagined blade to my tongue or eye ball. Yeouch!
Sometimes, while driving I image the vehicle I'm in miraculously not existing. In my head I go tumbling and sliding all over the road. Strange.