In the past people put moonshine in pottery jugs. Children had a habit of getting into everything including this moonshine. Therefore, the potters put ugly faces on the jugs in order to scare the children away from the moonshine.
Another story of the History of Face Jugs goes like this:
The ugly faces were made on the jugs and put at grave sites to scare the evil spirits  away.

 The tradition of pottery with faces dates back to Egyptian times and appears in many other cultures throughout the ages.  Today, face jugs are prized by collectors around the United States for their comical and sincere facial expressions. Much more historic detail of face jugs is available on-line.
Steve Weslow is a clay artist in the backwoods down-east area of Maine, and has thoroughly enjoyed frolicking in the mud for over 20 years!  His work is highly sought out throughout the world.

Steve decided one day to marry his strange, weird, wacky, creepy, spooky, freaky, and just not right sculptural faces to the traditional jug form, and, whammo! FACE JUGS!     “I have found a great passion in creating my work through this rich folk art tradition in my own unique whimsical style! I consider myself a constantly evolving artist, one day making tiny face jugs, the next day disturbingly large ones! and a little of everything, and I mean EVERYTHING in-between.”

“Wherever my creative life leads me, I will undoubtedly be creating these confounded things until I am DEAD! They are highly addicting, toothy, textured monsters that constantly peck, poke, and bite their way into my psyche, driving me to bring them into our world!”