Deliberately, I mean.
DS does things he knows will make me angry/get a rise out of me, as he would his sibling. Same to DH. Pulling on my bag when I’m walking, carrying on after I’ve asked him to stop until I snap. Putting his cup in my face at dinner time. Throwing clean laundry at me when I’ve asked him to put it away, then laughing.
He’s nearly 7.