I saw the effect of rock salt on the back side of two buddies in the The 7th grade. We had an orange grove behind our school and every once in a while we would jump the fence and help our selves to a snack. Well the old farmer got tired of our pilfering and one day a couple of buddies jumped the fence a few moment later we heard shooting and screaming. These two young men flew past us like they were on fire, which their back sides were, and went straight for the showers. Well we all took off after them and they hit the water dropping their pants trying to wash the salt out. I must say we all got a good laugh out of that after words. It also goes without saying no more oranges for lunch.