A student burst into his professor’s office and says, "Professor Stigler, I don't believe I deserve this 'F' grade that you've given me!"

To which Professor Stigler replied, "I agree, but unfortunately it is the lowest grade the University will allow me to award."

Phil and Will built a skating rink in the middle of a pasture on a cold winter.
A shepherd leading his flock decided to take a shortcut
across the rink. The sheep, however, were afraid of the ice and
wouldn't cross it. Desperate, the shepherd began tugging them to the
other side. "Look at that," remarked Phil to Will. "That guy is
trying to pull the wool over our ice."