Sit down! Is your father a glazier?

My mother's family was in construction (father, brothers ...). She said that when she was young, if you blocked somebody's view, they would say "Sit down! Is your father a glazier?" (If you don't get it: the idea is that if you want to stand in front of somebody, you ought to install a window in your body for them to see through.) When they said that to my mother, she would reply "Yes."