It's after dinner and we have more information about this Flanderen tradition. It dates back to the medieval ages, probably somewhere around 9-11th century, when live animals were used. Since 1927, protection against cruelty to animals ensures that a vet humanely kills the goose before humans try to separate it's head from the rest of the body. The "sport" is called "gansrijden" and you can see videos on YouTube. If you can handle the poor translation, you can read more at this link - click here.