This still gets me...
When I was about 12, my father taught me how to use the lawn mower and let me mow the lawn once a week for a few months before he started doing it again because I wasn't that good at it. Out of the blue, one day I got bitched out beyond belief for not mowing the lawn. I was never asked to do such a thing for months, so when I asked why he was so mad later that day, his explanation was that when he was a kid, he would just do things like that without being told to.