Lauren McCarthy's Happiness Hat is a device that stabs you in the back of the head with a metal spike every time your face slips out of a smile. It also makes a noise that's about as irritating as fingernails on a chalkboard. God only knows what would happen if you sneezed. You'd probably break a tooth.

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.

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