Also, the father of the family I stayed with was a policeman. They sacrificed water buffalo, goats and chickens to their trucks, cars, and motorcycles, respectively. I took pictures.
The theory was approximately, "If the god of the wheel does not get it's blood through sacrifice, it will get its blood by driving over somebody."
On the same weekend, I think, we sacrificed a goat and ate it. Here's the head:
Mmm Mmmm Good!