You shouldn't steal laundry detergent.
Polly is at the laundromat when she realizes that she left her laundry detergent at home.
Polly wants to get some detergent to wash her clothes with.
Polly goes to the laundromat's mini-store and purchases a small container of her favorite detergent.
Polly notices another laundromat patron with the same laundry detergent she normally uses, and grabs it when he isn't looking.
Polly is able to wash her clothes without having to return home for detergent.
The other patron searches the entire laundromat looking for his detergent before being forced to spend money on another bottle.