I was a car hop in an A&W drive in as a teenager. They didn't want girls as car hops because all the guys hung around, flirting with the girls and caused too much trouble. (For our "foreign" friends, car hops wait on cars who park is a lot next to the refreshment stand.) There isn't anything like freshly brewed A&W in a frosted mug.
If you put a scoop of vanilla ice cream in a mug of root beer, you get a Black Cow. Just wanted to find out who's an old-timer on the Cat. :-)
Jerry