Poor hygiene
Student days are often a time of learning about keeping a house clean, how often you actually have to shower before your housemates start complaining, and how long a giant bag of pasta will last. You would usually expect a functioning adult to understand how washing utensils work, though.
This sitter apparently skipped that lesson, and the nanny cam revealed the gross truth. Cutting apples for snacks, licking the knife, and putting it back in the drawer – yuck! Aside from being a truly disgusting thing to see, I’m sure the mom then spent the rest of the day washing everything in the cutlery tray just in case she’s used those as well.