When they get to the point of asking the consequences, they are weighing the "is it worth it?" options. That's when I pull out the big guns. In my difficult child's case, it's watching wrestling, playing with-his wresting cards and dolls, and playing with-his friend, Henry. So I calmly say, "No playing with-Henry." CALMLY. That's when you get into the shower and shut him out. (That's easy now ... my difficult child is 11 and going through the gross-naked person-stage, so I can threaten, 'If you keep bugging me, I will take off my bra and put on my jammies in front of you." Sends him running every time, LOL.)
IOW, as Beth said, make a list, mental or otherwise, and memorize it and use it consistently.
And as TM said, he can go to school in PJs. (Okay, I have put uniform dress code pants in the trunk because I know he'll renig when we get to the pkng lot, but at least we're on time!)
I'm glad you walked home and burned off steam. I always wear good sports shoes to get my car repaired just in case that happens.
Sorry about your day.