I was calling Sleets because I wanted to talk to the man who invented the high five. I'd first read about him in 2007 in a press release from National High Five Day, a group that was trying to establish a holiday for convivial palm-slapping on the third Thursday in April. Apparently, Sleets had been reluctantly put in touch with the holiday's founders, and he explained that his father, Lamont Sleets Sr., served in Vietnam in the 1st Battalion, 5th Infantry -- a unit nicknamed The Five. The men of The Five often gathered at the Sleets home when Lamont Jr. was a toddler. They'd blow through the front door doing their signature greeting: arm straight up, five fingers spread, grunting "Five." Lamont Jr. loved to jump up and slap his tiny palms against their larger ones. "Hi, Five!" he'd yell, unable to keep all their names straight.