Did this in north Alabama back in the mid 90s for a school fundraiser. They hired a surveyor to plot the squares on the football field. We discovered that the field was narrower on one end by about 7 feet! The cow plopped on a square boundary with an unsold square so the winner only got half. As I recall it was a whole lot of standing around and waiting. Funny for the first 20 minutes, then very, very boring.