...and when grandmother told any stories, he would interrupt her with “but;” or...get behind her chair, put on a pair of spectacles, and imitate her very cleverly, to make people laugh. By-and-by he began to mimic the speech and gait of persons in the street. All that was peculiar or disagreeable in a person he would imitate directly, and people said, “That boy will be very clever; he has a remarkable genius.” But it was the piece of glass in his eye, and the coldness in his heart, that made him act like this...His games, too, were quite different; they were not so childish. One winter’s day, when it snowed, he brought out a burning-glass, then he held out the tail of his blue coat, and let the snow-flakes fall upon it. “Look in this glass, Gerda,” said he; and she saw how every flake of snow was magnified, and looked like a beautiful flower or a glittering star. “Is it not clever?” said Kay, “and much more interesting than looking at real flowers. There is not a single fault in it, and the snow-flakes are quite perfect till they begin to melt.” The Snow Queen
It's no secret that Andersen hated children and the aristocracy, but apparently his disapproval extended to skeptics, actors, and, seemingly, number theorists.
