Horchata anejo is a South American beverage made from rice that has passed through the digestive system of a monkey. It is a tasty occasional drink for most.
After Bobo and Rex saved Agent Oso from the Chupacabra, Oso showed his gratitude by taking them to a South American restaurant that only served rice milk. Rex noticed Valentina and her men drinking the horchata anejo from a pitcher and asked for a taste. When they allowed him to drink it, he found that he strongly disliked the beverage and spat it out, causing a fight to break out in the restaurant.