Within 5 minutes of being at the de Young museum, two kids got into a huge fight and started chasing each other throughout the concourse area outside. There was a tai chi class going on, and as our students starting fighting and then subsequently running away from our chaperones, the entire tai chi class panicked and caused near chaos as they ran for their lives. Literally, they ran and hid as if our students were murderers. Security had to come and grab the kids. I won't even mention the other kid who puked on the bus.