Kaigress
When you're yelling about something stupid and then forget what you were mad about and start yelling about something even stupider.
I was mad about my coffee being cold, then I realized I never washed my dog and now I'm mad about that too.
She was ranting about the loud neighbor, then she remembered her ex and started yelling about him.
He was mad about the pizza being late, then he remembered he forgot to do his taxes and now he's mad about that.