Sand in the Pants... or Rocks?

We were over at the beach the other day sucking up more gorgeous sun and Connor said that he had rocks in his pants. I looked at him, a bit concerned, and blew it off thinking he was talking about sand. So I told him to rinse his butt off out in the water. Made complete sense. He decided to use his bucket instead. Whatever.. the kid is great at improvising so I thought it was a great idea. An hour later he had to go pee so I took him to the bathroom. When I peeled his shorts off I have to say I was speechless over the amount of rocks, yes rocks - not sand - that fell onto the floor, most of which were bigger than pebbles you'd find in a fish tank. OUCH!!! Seriously, I wanted to get a broom to sweep up the rocks because someone was going to hurt their feet in that stall. Never mind my kids butt...