Yeah, it can be. When I get started.. I usually just CAN'T or WON'T stop until the consequences kick in! Believe me, I've gotten my share x 10 worth of groundings from the parents.

Lots of things can set me off. But I'd say the number one things that causes me stress and/or anger is school and family problems. (sister being a brat, fights and arguments with parents, homework, grades, etc.)