An American tourist walks out of a Mexican train station when he notices he isn't wearing his watch.
A Mexican man is resting under a sombrero under a nearby tree.
The American approaches the Mexican and asks, "Excuse me, do you know what time is?"
The Mexican looks at the donkey, grabs its balls, and replies: "4:30."
The American asks, "How do you know that?" The Mexican replies:
"Well you get a handful of the donkeys balls and lift them up so you can see that clock across the street."