The Love of Three Oranges and that citrus smell gag: sixth scents?

Scratch and sniff opera: At “Love for Three Oranges” in 1998, patrons received a scratch and sniff card. During the production someone would hold up a number and audience members would scratch off the corresponding number on their card and be “rewarded” with a scent that complemented what was happening on stage. The scents: gunpowder, disinfectant, fart, meat, perfume and oranges.

-Portland Opera at 50: grander and weirder than you thought | OregonLive.com

There’s a gag in my stage play version...