The Great and Powerful Trixie would happily tell you that not only is she one of the most elegant and competent unicorns in Equestria, but also one of the most gracious, forgiving, even-tempered, and tolerant ponies in the world.

And on the birthday of that insufferable Mud Briar, the Great and Powerful Trixie was about to prove once and for all that she is not any of these things.

No, she was actually rather a terrible person in general. (And not a very good murderer, either.)