My moron used to get so "dumb" just before a big blow up. I called it his "Duh mood." Maybe it was done on purpose just to annoy me so the minute I rolled my eyes or got a tone in my voice, he had reason to attack.
One day, I'm getting out of the shower and combing out my long, wet hair... he says, with a criticizing tone, "Uh, there's water on your shoulder!"
Gee, ya think!?!