Two men were walking through a field one day when they spotted an enraged bull. Instantly they darted toward the nearest fence.  The storming bull followed in hot pursuit, and it was soon apparent they wouldn't make it.

Terrified, the one shouted to the other, "Put up a prayer, John. We're in for it!"

John answered, "I can't. I've never made a public prayer in my life."

"But you must!" implored his companion. "The bull is catching up to us."

"All right," panted John, "I'll say the only prayer I know, the one my father used to repeat at the table: 'O Lord, for what we are about to receive, make us truly thankful.'"