Shut the Door
The best way to irritate any sibling is when a younger or older sibling comes in your room for no apparent reason to just barely leave the door open. The door starts out shut, what is so difficult about them taking it with them when leaving. The same thing with the lights, if the light starts out off they think that they need to turn them on just to do nothing and then proceed to leave without turning them back off. I don’t understand the point of irritating a sibling when it isn’t necessary. That’s why beating siblings is bad.