Example:
Kid: hey mom can i have some money to buy my new game?
Mom: no honey you have to earn it first.
Kid: How?
Mom: look around you. look in your room.
Kid: my room is fine
(full basket of cloths that could be emptied. trash could get picked up, bed could be made)
(mom starts telling him to do things and kid starts to get annoyed by having to clean his room)
Aggression comes from enzymes in the brain when we get annoyed or upset.
This situation would most likely cause aggression in the kid because he wants his video game now and doesn't want to work for it.
And to calm down the kid should use a coping skill. Like taking space or reading, or drawing.
Hope this helps