Joke: Count the legs

"I bet you don't know how many sheep ther are in this field?" said the English farmer to the Irish visitor.

"The Irishman glanced around the field and then replied, "Three hundred and eighty six."

The farmer was astonished. "That's incredible! You're perfectly right. How did you manage it?"

"Oh, it was quite simple," said the Irishman. "I just counted the number of legs and divided by four."