Gangaram Bridgelal, a 35 year old Queens man, pulled his white Chevrolet van up alongside the first of two Timber Point Elementary School buses, with sixth-grade children headed out on its field trip to Riverhead, and waved back at the girls playing sweet n' sour with strangers.  Wave back and you're sweet.  Don't and you're sour.  Bridgelal started out sweet, then lowered a dark tinted window, raised his index finger and beckoned the girls to wait.  Then he got sour.  He kept pace with the bus, he pulled down his pants and began masturbating.  

A teacher on board used a cell phone to call 911 and a Suffolk police highway patrol officer was dispatched.  Bridgelal, of 140-35 243rd Street in Rosedale, was pulled over on the east side of Sunrise Highway in Shirley.  He was taken into custody and charged with public lewdness and endangering the welfare of a child, both misdemeanors.