Before your next pool party or summer barbecue, make sure you buy enough Summer Treats Favor Kit (for 1 Guest) for each guest. Included in the set are a Popsicle pencil, a sandal straw, mini deck of flip flop cards, ice cream punch cone and a flip flop goody bag. While flip flops were worn by ancient Egyptians, they weren't call that until the 1900s. They get their name from the sound they make when someone is walking while wearing them: flip . . . flop . . . flip . . . flop.