A rather dim fella takes up a job as a laborer on a farm. He's plenty of help, as although he's not too bright, he's a big guy with plenty of strength.
One day the farmer tells him to take the work truck and drive a load of feed up to the north 40 to feed the horses at the stable there. "But I doesn't know how to drive boss!" exclaims the worker! The farmer tells him it's easy, and gives him a short tutorial on how to work the pedals and such. "If you have any problems, just call me on the radio and I'll talk you through it." the farmer tells him.
About 10 minutes after the hired hand leaves, there's a frantic call on the radio, "I've run over a pig! He's jammed in the grill of the truck! There's blood everywhere, and he's smashing about something awful!"
"That's alright," says the farmer, "accidents happen. Just take the rifle out of the back of the truck, put him out of his misery, un-jam him from the grill and be on your way."
Another ten minutes goes by, and the farmer decides to check up on his help. "Well, are you up to the stable yet?" "No," responds the worker, "I shot the pig like you said, and un-jammed him from the grill, but I can't get his motorcycle out from under the front axle!"