This is “the” joke I read in Spanish at a restaurant in Tulsa many years ago. Upon reading it, I realized that whatever controls language had clicked full-on for me in Spanish. The subtlety of the dumb joke caught me off guard and I’ve not forgotten that moment.
A Sergeant and his Lieutenant are on the edge of a wide prairie. Both are laying behind a slight rise on the perimeter of the prairie. The Lieutenant looks through his spyglass.
“Sarge, take this and look at the group of Indians riding toward us and tell me if you think they are friends or enemies!” The Lieutenant hands Sarge the telescope.
The Sargeant hits the Lieutenant on the shoulder. “Duh! I don’t need to use the telescope. They must be friends if they are riding so close together like that!”