What is the most ridiculous law you've ever heard of?

I was watching the news the other day, and was dumbfounded when I heard the story of a man who got a DUI while riding a horse. Seriously. The horse wasn’t drunk, what’s the problem here? Then again, you know it was the best day of that cops career. No domestic disputes, no drug busts, no speeding tickets, just the drunken cowboy. YEE-HA!