The Lone Ranger and Tonto ride into town on a winter's day
They pull up outside the saloon and the Lone Ranger says, "I need to see a guy in there - you'll have to wait out here, it's against the law to let you in a place where liquor is sold".
Tonto scowls. "But it's freezing out here, kemo sabe!".
"I can't help that - the law's the law," says the Lone Ranger. "You'd better get down and run around a bit to stay warm". So down gets Tonto, hitches up the horses, and begins running around them in circles while the Lone Ranger goes into the saloon.
After a couple of beers and with his business done, the Lone Ranger looks up to see the sheriff coming in; and the sheriff looks him up and down and says "Hey there, stranger - is that your hoss hitched up outside?"
And the Lone Ranger says, "Yes - is there anything the matter with that?"
"Nope," says the sheriff...
..."but you left your Injun running."