A man went to visit his 90-year old grandfather and while eating the 
breakfast of eggs and bacon prepared for him, he noticed a film-like 
substance on his plate. So he says, "Grandfather, are these plates 
clean?"
His grandfather replies, "Those plates are as clean as coldwater can 
get them, so go on and finish your meal."
That afternoon, while eating the hamburgers his grandfather made for 
lunch, he noticed many little black specks around the edge of his 
plate, so again he asked, "Grandfather are you sure these plates are
clean"?
Without looking up from his burger, the grandfather says, "I told you,
those dishes are as clean as coldwater can get them, now don't ask me
about it anymore."
Later that day, they were on their way out to get dinner. As he was 
leaving the house, Grandfather's dog, who was lying on the floor, 
started to growl and would not let him pass.
"Grandfather, your dog won't let me out."
Without diverting his attention from the football game he was watching,
his grandfather shouted, "Coldwater, get your butt out of the way!"