coke subliminal- thirsty face

In this old packaging for coke people say there is a thirsty face been shown?

Idea

Taking the brief Zabriski point i decided to go down the routes of advertising and sound effects that were shown throughout the film. i decided to look into the subliminal side of advertising and started reserching into Derren Brown as he uses subliminals and is successfull with his experiments but you never know if this is real. A subliminal is suppost to work if there is a goal in mind (for example showing drinks in an advert when someone is thristy makes them buy a drink.) but experimentation is required.