DuPont Puns

So I work at a hardware store/fish & tackle shop on a fairly affluent barrier island in Florida...tons of rich old WASPs (we're talking DuPont heir money here).

Anyways, a regular comes up to the front register with a saw and some saw blades. I took note of his purchases and said to the guy "How do these work? Some sort of coping mechanism?"

He looked down for a second, began to explain (in a somewhat demeaning tone) how a coping saw works, looked up and saw my shit eating grin.

grooaaannnn "Oh you ass, that was witty. You got me though!"

I later learned that day that his wife had died three months earlier...whoops.