A guy walking down a street

A guy walking down a street one afternoon passes an old man sitting on the side of the road with a large sack.

The younger guy says to the old man, “Watch a got in the sack?”

The old man responds, “I got some monkeys in that there sack.”

The younger man asks, “If I guess how many monkeys you got in the sack, can I keep one?”

The old man replies, “Son, if you guess how many monkeys I got in this sack, I’ll give you both of ’em!”