Sally (brandishing map like a flag): Mrs. T! Mrs. T! I just got back my map and there is a BIG problem!
Me: Oh dear, Sally, what seems to be the trouble?
Sally (very aggrieved): Well! I just got back my map and YOU said that I didn't do the Gobi Desert! See right there in the corner, you took off two whole points for the Gobi Desert.
Me: Yes, I see that you lost points for the Gobi Desert.
Sally: Well that just isn't FAIR! I had the Gobi Desert put in right there (gestures to map). It's not missing at all!
Me: Sally, you didn't lose the points because the desert was missing. You lost them because you placed the desert in Indonesia.
Me (as patiently as I can possibly manage): Well the Gobi Dessert is not actually located in Indonesia. It's much further north. You know, around Mongolia?
Me: It's not just about having the feature on the map; it has to actually be in the right place to get credit.
Sally: Oh. Yeah. Okay.