The Catalonian tradition of including a man pooping in the Christmas nativity for good luck.
In the Catalonia region of Spain, in the northeast corner of the country, there is a Christmas tradition of including the statue of a man defecating in the nativity scene. The caganer (aka “the pooper”) is typically a man wearing the traditional Catalan clothes of a red cap, white shirt, and black trousers who is crouched down pooping.
While Jesus, Mary, & Joseph are at the center of the nativity scene the caganer is usually off to the side. He can also be moved around each day in a little game of hide and seek. The purpose of the caganer is that he brings good luck by fertilizing not just the land but also the future of the family who owns the nativity. It also shows that everyone is truly equal, that everyone poops. Caganer statues are available in shops around Barcelona and aren’t just limited to the traditional style. You can find caganers modeled after world leaders, celebrities, movie characters, the pope, Disney princesses, and more.
The caganer isn’t the only Catalonian Christmas pooping tradition. The Tió de Nadal (aka the “Caga Tió” aka the “poop log”) is a wooden log frequently with a smiling face painted on the one end and little legs to prop it up. The tradition is that children will leave little bits of food for the tió during Advent and on Christmas Eve or Day they beat the log with sticks while singing. This ceremony induces the log, which is partially covered by a blanket, to poop little gifts for children (which have been hidden under the blanket). Once it has served its purposes the log is burned in the fire or thrown out.
Added info: The Catalonians have several traditions associated with pooping. One expression sometimes said before eating is “Menja bé, caga fort!” or “Eat well, poop hard!”