context: When I was at work last night , I found a message on my voicemail . It was from my son's bus driver ! I had made up a bunch of business cards for Nathan last year , that stated that he has autism , and here are some things to be aware of ( like not to touch him , he has trouble communicating when he is upset or frustrated , etc . ) I've asked Nathan to give these cards to any new bus driver he has , and to substitute teachers , and to daycare people .
question: Why would the bus driver have called and left me a voicemail ?
reference: To get more information on understand Nathan's condition .
candidate: He was upset with the way I was behaving.