From The Glass Menagerie by Tennessee Williams

Jim: Is it broken?
Laura: Now it is just like all the other horses.
Jim: It’s lost its—
Laura: Horn!
It doesn’t matter.  Maybe it’s a blessing in disguise.
Jim: You’ll never forgive me.  I bet that was your favorite piece of glass.
Laura: I don’t have favorites much.  It’s no tragedy, Freckles.  Glass breaks so easily.  No matter how careful you are.  The traffic jars the shelves and things fall off them.
Jim: Still I’m awfully sorry that I was the cause.
Laura [Smiling]: I’ll just imagine he had an operation.
The horn was removed to make him feel less—freakish!
[They both laugh.]
Now he will feel more at home with the other horses, the ones that don’t have horns….