Indecent exposure

A blonde is walking down the street with her blouse open, exposing one of her breasts.

A nearby policeman approaches her and remarks, "Ma'am, are you aware that I could cite you for indecent exposure?"

"Why, officer?" asks the blonde.

"Because your blouse is open and your breast is exposed."

"Oh my goodness," exclaims the blonde, "I left my baby on the bus!"