Event: Cinderella's slipper fell off her foot.
Hypothesis 1: When reading a story, an author can write his/her character in a way which we forget that they aren't that different than us. So my guess is that Cinderella was so tired from all the dancing that the slipper just fell off.
Hypothesis 2: Or maybe she wanted to get rid of both shoes but didn't have enough time to do so. Poor girl.
(I could go on but I think that some of us don't have the patience to read this whole thing)
Solution: Girl, just wear sneakers to your next ball.
Thoughts @JaneKinder ?