The mechanical bull is a fixture at the Cinco de Mayo festival and a near certain path to humiliation for the riders. You find these in bars all over the country, too. My Flickr pictures that have received the greatest number of views and likes by far were taken of one of these machines in a bar in New Orleans. A rather tipsy young lady was riding and, due to the violent motion, some of her garments were, um, falling off. You can find them easily enough if you like.