Licking Things At Goodwill

I went by a family, a mom, another lady, and a couple kids together at Goodwill. I saw one of the kids but I didn't see him licking anything.

But as I passed by, I heard behind me, "What are you licking that for? What if another kid licked it, then put it in his butt crack, then licked it again?"

Yes, it's that second licking after the butt crack that would truly contaminate it.