I was cruising along a reef off of North Florida and spotted a neat old little bottle, like the kind they sold Snake Oil in back in the 1800's. It was laying on the sand about three feet from the edge of the reef. I went to pick it up to put in my ditty bag and a little bitty fish swam out and bit me on the finger! He was only about an inch and half long but he drew a fair amount of blood. I pushed his bottle home a little closer to the reef so he would be closer to food and less conspicuous to other divers and paddled away.
On another occasion, a group of us had surfaced, swam to the club boat and were waiting out turn to roll up on the platform. Somebody yelled "Ow. Watch where you put those tanks. They just smacked me in the back of my head". Somebody else said "Who are you talking too? There's nobody behind you".
After some confused investigations, we discovered a set of twin 72's with regulator floating with nobody attached. None of our divers claimed them and there was no other boats around. We turned it in at the Coasty Station and notified the LDS. Somebody claimed them pretty quick. He had taken it off to get in the boat and they were gone when he turned around to pull them in behind him.