Comment by taneq

> So basically, boy acted like normal 4 years old and took an interesting thing into hand?

A 4-year-old is old enough to know what they are and aren't allowed to grab, in terms of common household items.

> However, if you constantly yell at four years old, four years old will learn to ignore everything except yelling.

If you consistently show a four-year-old that only yelling will be followed by physical intervention, then they will learn to ignore everything except yelling. If you consistently show a four-year-old that a quiet "I'm going to count to three... one... TWO..." will be followed by physical intervention, then they will learn to pay attention to that.

The default attitude of most four-year-olds is "make me" and if you let them know what will result in you making them do the thing, they will pay attention.