One of my coworkers rides the Baltimore metro to work in the mornings. The Baltimore metro is a whole post in itself, but to make a long story short: there is only one line. It goes from a random suburb into downtown, so only people who need to travel along its non-sensical route can make use of it. Largely it is populated by crazy and/or homeless people who ride it around aimlessly. My coworker often regales us with stories of the insanity she witnesses on her 10-minute ride to work.
This morning she told us she'd seen a painfully young mother dragging her two-year-old down the metro stairs, shouting "Come on Muggles! We've got to catch the Hogwarts Express so we can do some magic!"
There was some discussion of how this was a cute way to get her child to hurry for the train. And it is! Except... it doesn't make sense. And I really tried to keep my mouth shut, but I couldn't.
"Heh, I wonder if her kid is going to hate that nickname when he gets older and reads Harry Potter for himself." [Blank stares] "'Muggle' is kind of an insult." [More blank stares] "Because... muggles can't do magic?"
"No, that's not true," another woman replied. "Hermione was a muggle and she did magic."
"Well, actually, Hermione was muggle-born." I clarified. "Her parents are muggles but she is a witch. That's why purists like Draco made fun of her. Her parents can't do magic. Because they're muggles. And muggles can't do magic."
And now I can never come to work again.