A toddler dropped his dacks and left some poos on the library floor carpet. No one saw it so it could have dropped out of the end of his trousers. Mother picked it up and threw it in the toilet. Then a staff member scattered the special vomit sand over the affected area and put out a warning cone. Apparently the poos were rock hard so the impact was not too severe.
It seems someone has already realised my android app idea:
Related snippet from the archive.