Woman says

What a woman says:
This place is a mess! Come on, you and I need to clean up. Your stuff is lying on the floor and you'll have no clothes to wear if we don't do laundry right now!

What a man hears:
Blah, blah, blah, blah, C'MON, blah, blah, YOU AND I, blah, blah, blah, blah, ON THE FLOOR, blah, blah, blah, blah, NO CLOTHES, blah, blah, blah, blah, RIGHT NOW.

haha, is there an acoustic device in their ears to block out the words they don't want to hear?

this is another difference between men and women!

YES, they only pay attention to those crucial words..

are these words crucial?

At that point of time, maybe yes..he is in the "MOOD"
I believe this man are so use to his wife nagging...so he just pick up those he likes to hear..hahahaha.