This drunk driving PSA by creative ad agency McCann uses an optical illusion to help demonstrate the consequences that alcohol can have on your sense of perception.
The ad called 'Reverse Test' was created for the non-profit organization Exodus Fondazione, and the anti-drunk driving PSA uses no post-production effects to create the imagery being used. The video's premise is simple and shows a small road sign behind a normal drinking glass.
As the glass is filled with water, the road sign slowly begins to change to the opposite direction. Text on the screen indicates the water is meant to represent alcohol, and the video shows how much water each serving of alcohol represents. The simple yet effective ad ends with a hand taking the cup away to reveal the original road sign next to a caption that states: "Enough to Affect Your Visual Perception."