The Lone Ranger and Tonto were out riding in the brush when they pull up and the Ranger goes into the bushes to relieve himself. Directly, while Tonto is waiting on his horse he hears the Lone Ranger cry out, "Tonto, I've been bit by a rattlesnake. Go get the Doc!"

Tonto gallops to town and tells the Doc. Doc tells Tonto what he must do to save the Lone Ranger.
Tonto gallops back repeating to himself "Suck poison from wound".

When he gets back to the Lone Ranger Tonto says, "Kemosabe, show me your wound" at which the Lone Ranger reveals his swollen member.

The Lone Ranger asks, "What did Doc say to do Tonto?"
Tonto: "Kemosabe, Doc says you're gonna die."