Smellovision 4

Interesting, that the Smellovision has indeed existed, thou not in the form of Hoax.

The movie Scent of Mystery (1960) was shown (at least in New York City) as a "Smell-o-Vision" movie. The theatre was equipped with a system that gave off various odours in synch with the film. The opening scene involved a butterfly flitting through a peach grove, with accompanying delicious odours. Later on, a barrel of wine fell off a cart going up a hill, and rolled down the street only to smash at the bottom, again to the accompanying odour.

http://www.imdb.com/title/tt0054271/trivia