Escape!

A blond, a brunette, and a redhead all escape from prison. They're running away when they hear the cops coming behind them.
"Let's hide in that shed over there" says the brunette.
So they hide in these sacks of potatoes so that the cops don't see them.
The cops come into the shed and one of them says, "Check those sacks of potatoes."
So they kick the one with the brunette...no noise.
They kick the one with the redhead....no noise.
They kick the one with the blond...the blonde whispers "Potatoes..."