I would “steal” stuff when I was little because I didn’t understand it wasn’t free.

For example, I might see “grab and go” shelves and think it meant you can grab everything you want and walk out.

Further enforced when I’d see milk that says “fat free” and think it means it’s free, with the word “fat” being seen as separate.

This happened at least a memorable amount of times at school and eventually they’d either not have stuff labelled like that or they’d disclaimer it.