One time on IRC the topic of what Boxing Day even is came up, and this guy said in seriousness that it's to memorialize the Boxer Rebellion, and we had a big fight about it. He backed up his claim by pointing out that the horse from Animal Farm was an allegory for said uprising, so he wasn't just making things up.
Ridiculous. Everyone knows it’s to commemorate Foxy Boxing, when a foxy boxer at a high-end strip club in Rhode Island sued her employer after her silicone breast implants were ruptured in a fight.