LIPREADING:

Researchers tell us that only about 25 percent of what is said can be understood by lipreading.

For example:

Suppose a woman says:
"This place is a mess! C'mon,
You and I need to clean this place up,
Your stuff is lying all over on the floor
and you'll have no clothes to wear tomorrow
unless we do the laundry right now!"

Her lipreading husband will get:
blah, blah, blah, blah, C'MON
YOU AND I  blah, blah, blah, blah,
blah, blah, blah, blah, ON THE FLOOR
blah, blah, NO CLOTHES blah, blah,  
blah, blah, blah, blah, RIGHT NOW!