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Cool Cans were special cans used by Pepsi in a 1990 promotion.
The various
designs of these cans included confetti, sunglasses, neon, and
surfing art. They had prizes printed on the inside of them as part
of a contest.
The Secret or trick to the Neon
Cool Can is to place one Neon can on top of another. Twisting one
of the cans around will eventually make what looks to be the word
"SEX" appear vertically across two cans. It is not visible with
just one can. It has long been contested that this effect was not
erroneous but in fact deliberately staged. Pepsi has always
maintained the occurrence to be of an accidental nature.