joke- a groaner

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 cold
water 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!"