Want to read some boring history about lunch counters?
Drug stores, dairies and department stores used to have lunch and refreshment counters. Depending on the selection of food items they were called lunch counters (short order food service) or soda fountains. Both usually had hand dipped ice cream, soft drink and sundae syrups and carbonated water outlets.
Two ice cream based drinks were available, malted milk shakes and ice cream sodas. Milk shakes might or not contain malt extract flavoring, but were primarily composed of flavoring syrup, hand dipped hard ice cream and milk. They were mixed by a malt machine, a mixer that used a crimped round blade, less than an inch in diameter, run at high speed to thoroughly mix the milk, ice cream and flavoring. Ice cream sodas were ice cream and flavored syrup muddled in a tall footed glass, then hit with high pressure carbonated water to kind of emulsify the first ingredients. The mixture was stirred together with a long spoon, then another scoop of ice cream was added, the glass was topped off with sparkling water and sometimes garnished with whipped cream and a cherry.
With the advent of soft ice cream machines, the malt mixture was introduced in liquid form into the machine, and the dispensed soft frozen drink was called a milk shake (or malt if it were added). The flavor and the flair is far from the original, and the ice cream soda is now pretty much instinct. But it was wonderful stuff (along with banana splits and solid ice cream sundaes).