Mine is DS#2. The youngest. If he gets tickled, he yells. If he gets chased, he yells. If someone teases him he yells. He yells at each and every opportunity. It's as if he needs to be loud to get heard and yells as a pre-emptive measure
DS~1 was on the trampoline with him tickling him. The yelling suggested a violent and bloody death. I worry about SS being called sometimes.