A horse walks into a bar and gets terribly drunk the night before an important racing carnival. The next day the horse is judged unfit to race and is executed. The barman is found guilty of serving alcohol to a visibly intoxicated horse, and is executed.
A horse walks into a bar. The barman says “Why the long face?”. (He’s never seen a horse before and doesn’t realise that horses, distinctively, have long faces.)
A horse walks into a bar. The barman calls the local agency responsible for the collection and temporary protection of lost livestock.
Several days later the barman hears that the horse has been returned to the property from which it had wandered.
Fancy that, though — a horse walking into a bar!
A horse with a lung on its face walks into a bar. The barman says “Why the lung face?”.
(It turns out the horse is a method actor preparing for its lead role in the motion picture biography of Lung-Face, The Alcoholic Horse.)