Warning!

While Sue & I were canoing, we found a couple of beach balls had drifted down to the dam at the lower end of the lake. We retrieved them and brought them back to the swimming area.
I was pretty amazed by the warning label on this beach ball. Somehow I had never thought of a beach ball as a hazardous object. It's too big to swallow and choke on. It's too soft to give you a concussion. So?

Just what constitutes "competent supervision" for beachball use, anyway? I mean, beyond what common sense would dictate for swimming in general.