Ever had to explain the rules of rolling to anyone?

I can't really recall ever meeting a new person in BJJ and having to explain the rules, sAve for pergaps my dad. Just thought it was odd. Certainly when I've attended judo and wrestling the rules come up quite a bit. Not in BJJ, other than reaping the leg I've never explained any particular rules to anyone. Im sure boxing and muay thai would be the same? Sort of struggling to think of other arts.

Have you guys ever had to tell new student s the rules of sparring?