One of them grabs the other and pulls him back from a 6-foot diameter, perfectly smooth hole.
"You saved my life" says the hunter. "I wonder how far down that hole goes..."
So they find an old anvil and throw it in the hole. As they're listening for the anvil to hit, a goat comes running up behind them, about 20 miles per hour, and dives into the hole.
A farmer comes along and asks the hunters if they've seen a goat. One responds "We're so sorry, we saw your goat run up behind us and he dove into this hole."
The farmer responds "That's impossible, I had him chained to an anvil."
