Finding it difficult to be happy with the current state of the world? Boy have we got the hat for you. The Happiness Hat takes a Pavlovian-style approach toward smiling, driving a metal spike into its wearer's head should he or she make the mistake of frowning.

The hat's designer Lauren McCarthy describes the function of the Orwellian device thusly,

An enclosed bend sensor attaches to the cheek and measures smile size, a servo motor moves a metal spike into the head inversely proportional to the degree of smile. Through repeated use of this conditioning device you can train your brain to smile all the time. The device runs on Arduino.

The knitted cap seems to be little more than an art project at present, but heck, it made us smile.