At first it wasn't that bad Harrison would just play pranks acting like he had fell. Nobody wanted a two year old to fall. He didn't though. And that got old.
Harrison obviously realized that.
So he switched it up a bit at age four. Scaring people. But everyone just seemed to laugh when they knew it was him. If he didn't show himself he scared the shit out of people expecailly the adopters.
At five he would mess with the food. Making it taste horrible. But leaving some for himself that he didn't ruin.
At age eight he went back to scaring people. Most would think it's harmless but these children they're parents died in war. And don't want to be scared.
But for some reason it seemed to stop when he turned 11. It made everyone paranoid. And he likes it the best.