Voice: In the early days of the West, the peaceful town of Sniddler's Gulch was threatened by one of the meanest desparados of all time, Cowboy X, a man who left his mark everywhere! (Cowboy X comes riding into town with a branding iron in one hand marked with the letter X.) Frightened Looking Man: It's Cowboy X! Cowboy X: Letter X! Letter X! Yipee!!! (he stamps an X) Voice: Cowboy X left X's everywhere - on the houses, on the streets, in the schoolhouse, X's on the horses, X's on the town hall, even on the good citizens of Sniddler's Gulch themselves! Cowboy X: (in the distance) X! X! Yipeeee! (Rides off, leaving a trail of X's) Voice: The citizens finally decided that Cowboy X had to be stopped. (Crowd noises) Man 1: Throw him in jail! Man 2: Run him out of town! Little Boy: (crowd dies down) Wait, what if we just ASK Cowboy X to please stop marking up our town with X's? Man 3: The kid's got an idea! Man 4: It's so crazy it might work. Woman: Here comes Cowboy X now. Cowboy X: X! Woohoo! X! Yiiiiiipee -- X! (Cowboy X screeches his horse to a halt and stamps an X on the boy's hat.) Little Boy: Cowboy X, would you please stop marking X's all over our town? Cowboy X: Why, sure ah'll stop! (laughs) Town: Aaaaahhhhh! Cowboy X: From now on, ah'll be known as Cowboy O! (horse neighs) Yiiiipeeeee!!! (Rides off, leaving O's all over the place.) Voice: And the citizens of Sniddler's Gulch lived happily ever, because they really weren't very smart!
https://primoaccordo.net/sesame-street/cowboy-x.htm