Today I learned: there's a tradition called Tió de Nadal in which a hollow log is adorned with a happy face and "fed" every night starting around December 8th. On Christmas Day, the log is partially placed inside the fireplace and beaten with sticks until it defecates presents. Making this up would be much less fun than actually reporting on a thing that really happens.

Tió de Nadal translates to "Christmas Log" but is often referred to as "Caga tió" - or "shitting log" / "poo log." It even has a song. Again, I could not make this up.

Atlas Obscura has a nice writeup on it. YouTube has plenty of logs being beaten. All told, it's a delightfully odd tradition to really let yourself deep dive into.