I'm not speaking from direct experience, but rather from an article I read in Car and Driver...
You can be charged with DUI for all kinds of unusual behavior. Here are some of the wackiest DUI arrests Total DUI has encountered:
When a 42-year-old man crashed a go-cart into a parked car on a public street, he was charged with DUI, fined $1,000, and given a two-year driver's license suspension.
Two Portage, Indiana women were charged with DUI after pushing a vehicle into a parked car. After the arrest, they were given blood alcohol tests to determine their blood alcohol contents. Both had BACs more than double the legal limit!
In Morristown, NJ, a man driving a zamboni around the Mennen Sports Arena ice rink was charged with DUI.
A charge of felony DUI resulted for a man in Vermont who decided to hop on his riding lawnmower while intoxicated.
Bill Murray, of Caddyshack fame, was arrested in Sweden after driving a golf cart to a restaurant while drunk. Murray refused a breath test, but could face jail time depending on his blood test results.
It also said that riding a bike or a horse while sauced could qualify as DUI.