The leader of the social skating group Wednesday Night Skate goes by the alter ego Mocha Superman. "Since this is technically an illegal street event," he said, "I try to keep my real name out of it." Last Wednesday evening he arrived in Union Square and ditched his collared shirt in favor of a red WNS tee and added wrist guards and a black bandanna. "It's part of the double life thing," he said. "Call me Clark Kent."

WNS started in May of 1996 as Blade Night Manhattan, and switched to its current name in 2001. Mocha got involved the next year and, "because I'm a control freak" [...]