I'm going straight through an intersection. The light is green. I'm going straight. A guy on a scooter coming from the opposite direction starts to make a left directly in front of me. By the way, I'm going straight. I slow down. he stops and starts yelling "YOU GOTTA SIGNAL! YOU GOTTA TELL ME WHERE YOU'RE GOING!"

If any of you guys can tell me how I'm supposed to signal "straight", fill me in.