Smile Hank is a photo that is known for the effect it has on the viewer. This thing about Smile Hank all started over a picture of a propane salesman.
The effects of viewing the Smile Hank image are the sudden alcohol-addiction and the urge to become a propane salesman.
The Smile Hank image is believed to be a fucked up picture of Hank Hill.
Those who have seen the Smile Hank image claim to have dreams in which Smile Hank comes to them and commands them to "spread the word of propane".