Look what you made her do: Alyse Alan Louis in Teeth. Photo: Valerie Terranova What a difference a poncho can make. Those audience members in the front row of Teeth , in its new iteration at New World Stages, are given plastic coveralls as they enter the theater, like guests sitting in the splash zone at SeaWorld except that they’ll be splattered in blood instead of water. The implication of the poncho, even if you aren’t wearing one (I was happily a few rows back, safe from flying fluids), is