"The Lone Ranger and Tonto" joke

The Lone Ranger and Tonto had been rounding up bad guys all day, and were
in big-time need of a beer. They rode their horses as fast as they could
to the nearest town, and tied them to the rail outside the saloon.
The Lone Ranger told Tonto to stay outside a little while and run around
Silver real fast so that Silver doesn't get sick from overheating.
Tonto said, "Sure thing, Kemosabe", and did as he was asked.
While the Lone Ranger was inside having his beer, a stranger walked in and
asked, "Who owns that big white stallion tied up outside?"
"I do", said the Lone Ranger, "what's it to you?"
The stranger ordered a beer, turned to Lone Ranger and said, "Nothin' to
me, Pardner, but you left your injun runnin'"