911!

So a few days ago at school, me and my group of 5 other people had to make a human scultpure that represented service. So decided to have 4 people pick up one person (as if carrying him to the ambulance), and another driving the ambulance. We asked the teacher to come out in the hall so that we could show her. She laughed and said, "That's great! It'd also be really funny if somebody shouted out, 'Hey who knows the number for 911!". None of us got the joke right away. Did u catch it? Haha.