Carolines on Broadway, the legendary comedy club in Times Square, taking the main stage can be a death-defying proposition — and not just because the audience, likely several drinks in by the time the headliner grabs the mic, expects to laugh uproariously and often. More than the crowd, it’s the very layout of the space that gets comedians’ pulses racing: There’s a curious gap between the dais and the wall, meaning one wrong step and… “The first thing they said to me,” says comedian Jo Koy, “was ‘If you back up, just remember, you’re going to fall.'”