You know, thinking about it I think the two closest calls I've ever had were on a mitre saw and I've done all manner of daft bloody maneuver on just about every machine shamefully.
One time I was cutting a bunch of triangular sections to 3" lengths for a staircase with a stop block and as I got to the end of one of the sections with about 5" left total I decided I would make the cut and just hold onto the offcut with a finger and thumb as I made the cut. Unbeknownst to me there was a split running down this small piece and when I cut into the piece it decided to split in half explosively and it all happened in a split second, one second the triangle was there and the next minute it had disappeared across the room, I was very fortunate to have sustained no damage whatsoever.
Another time, being a real ***** on site one time I decided to use the mitre saw to rip a few mm off a 100x40mm x 100mm long softwood square along the grain, which is a big no-no on a mitre saw and even I knew that at the time but I still bloody attempted it. Had I had a zero clearance fence screwed to the front of the fences to close up the gap I probably would've been fine but I didn't and I certainly didn't have enough support behind the block for the cut so when I started cutting with the grain the saw bit into the timber, twisted it around in the cut since there was little support behind and chucked it a fair distance, this time my hand hurt instantly and I thought I had done some serious damage but there wasn't a scratch at all. I'm not sure to this day whether my hand smacked the side of the saw plate or not, it all happens so bloody quick.