I had a student between 18 and 20. He was from a small town and not used to city life so I was training him on para-transit, doing research to locate a place he wanted to go visit and on researching fixed bus routes to the location as well. His smart phone was acting up and he didn't feel confident he could use his normal research methods non-visually with what he had so I took him to an office phone to call directory assistance and the bus company. He started his research and while he was on the phone talking with the lady at Metro, he casually unplugged the handset and walked across the room. It was all I could do not to laugh right in front of him. I connected the handset for him in a hurry so he wouldn't lose his call as I didn't think that was the time to have a lesson in phone mechanics. I don't know if he thought one just needed it plugged in to use the number pad or what but it was totally unexpected. I had to share that with other O&M teachers. In a few years I might change it to she and put it on facebook.