A farmer driving down the road spots a sign: "Mule For Sale." He decides to inspect the animal. The owner claims it's the fastest mule alive and quite unique.
The owner explains that the mule only moves when it hears "Praise the Lord," and the more it's said, the faster it goes. To stop it, one must say "Hallelujah." The farmer decides to test this. He mounts the mule and shouts, "Praise the Lord!" The mule takes off. He then yells, "Hallelujah!" and it stops.
Seeing he's a good distance away, the farmer decides to see how fast the mule can go. He repeatedly shouts, "Praise the Lord!" and the mule speeds up.
Looking up, the farmer sees he's approaching a high cliff overlooking a deep canyon. He realizes he must stop the mule but has forgotten the command. In a panic, he starts shouting random words: "Amen!" "Glory!" "Sweet Jesus!" "Amazing Grace!" As he gets dangerously close to the edge, he finally remembers and yells, "Hallelujah!!!" The mule stops dead in its tracks.
Out of breath and shaking, the farmer wipes his brow, looks up to heaven, and sighs, "Whew! Praise the Lord!"