I call this being a smartass and I remember the first time I ever did it at age 11. I was second in line at the neighborhood ice cream stand and the guy in front of me was ordering a milkshake. The server asked "Would you like that in a bag?" and I blurted out "No, he'd like it in a cup." He laughed but she scowled and I suddenly realized she would also be preparing MY order. I decided to come back another time.