You may have noticed 'Happiness' signs all over St. Pete and Gulfport. Gary King hangs up 'Happiness' signs"All I'm doing is a subliminal experiment using a word - one word," King said. Gary's son, Jason"I was put in a position where I wanted to change my own life and do the best I could by changing other people's lives by putting up these happiness signs. The happiness experiment has changed our lives and the lives of many. "I first saw the happiness experiment TB signs on the day of my miscarriage last year.