Telling Time

A Cowboy riding down the trail encounters an Indian laying on the trail with hard on. The Cowboy asks, "What are you doing?" Indian says, "Me tellum time." Cowboy shakes his head, rides on, encounters another exactly the same. Says, "You telling time?" "Yup." "How can you tell time like that?" Indian says, "Workum like sundial, readum shadow." Cowboy, incredulous, rides on. Encounters Indian in trail masturbating. Cowboy says, "Let me guess, you're telling time too." Indian says, "Nope. But me windum clock!"