The teacher showed film strip (!) on the French explorers for social studies. There was a section on Verrazano, and she had a kid go up to the screen and point out the mouth of the Hudson River...except that the place she very specifically directed him to was the opening of Chesapeake Bay.

I was torn between pointing it out and keeping my mouth shut, but in the end I chose to keep my mouth shut. As much as I wanted to say, "Um, actually the Hudson is up there." I didn't want to correct her in front of her class.