and yes I always try to use eye protection these days...
I actually hit myself in the lip one day. I was hanging out in the woods in a place we called "The Dump", though it wasn't really a dump, but a large open place that had a small natural pond. We used to practice our marksmanship by shooting dragon flies that would hover over the water.
One day I shot a BB at an old car tire that someone had thrown into the water, and I literally watched the BB hit the tire and bounce right back and hit me in the lower lip. It was as if it was in slow motion. I was about 30-40 feet from the tire. It stung! No damage done, but lesson learned. :)