Are you a giant midtown tower? Then you've probably been overcharged by Con Edison. Are you someone who got through last summer's heatwave intact? Then you've probably been overcharged by Con Edison. Are you a resident of New York City? Then you've probably been overcharged by Con Edison. But at least one customer noticed such a mistake in time to do something about it—this Redditor got a bill for over $500 (as you can see below) because "they didn't send someone to read the meters in my building." In the end, she had it adjusted to $73.

Moral of the story: always assume Con Ed is ripping you off, always check your bill closely, and when in doubt, read your own meter—it's actually not that difficult to do!