Frank n'E. are scruffy lookin street people, old enough to be wise - but not enile.
One of 'em is in a 'greasy spoon' Cafe (er: the name says it all). Usual pot-bellied cook in dirty T-shirt.
He sees a sign, over the big soup pot,
DO NOT STIR THE SOUP
Asks, "er why not?"
"Because you would not like what you would see, Sir.."