Are you a man or a mouse? At a Thai restaurant, your fellow diners will sit in judgment. The level of heat you ask for is not just a personal preference but an index of your toughness, nay, of your authenticity. Pi’s heat levels should be approached with caution. The prices are friendly, with $1.69 spring rolls that are superior. The pad kee mao (“spicy noodle”) has wide, slippery noodles heaped with generous amounts of smoky chicken and crisp vegetables. The gang gai (red curry chicken) has fiery red chili paste that's only slightly alleviated by the sweet blandness of the coconut milk. Limited seating. No credit cards, no booze. Call ahead 15 or 20 minutes to place your order. Open 11 a.m.-8:45 p.m. Monday through Friday and noon-8:45 p.m. Saturday.