7. Odorama: Polyester (1981)
Director John Waters designed Odorama - a "scratch-and-sniff" gimmick in which special cards with spots numbered 1 through 10 were distributed to the audience before the show. When a particular number flashed on the scene, viewers were to scratch and sniff the corresponding number on the card, and take in that particular scene, some of which included flowers, pizza, glue, gas, grass, and - believe it or not - feces. But you never knew what you were going to get. After being prompted to scratch and sniff a bouquet of flowers, the audience would receive a whiff of old sneakers; hence, the joke was on them.