In my previous line of work I sold electronics. I had a customer call about a VCR problem, she was maybe 80 yrs old or so, said it wouldnt play.
I talked her through all of the proper set up and hook up with her over the course of 30 minutes, then it dawned on me..
me: Ma'am, this might sound silly but after you put the tape in, did you press play?
her: Well I didnt know you had to do anything else.. where is play?
Damnit it took a half an hour and she'd never pressed the play button.
