"Wow.. that looks deep!" "Sure does. Toss a few pebbles in there and see how deep it is." They pick up a few pebbles, throw them in, and wait.....no noise. "Doggone, that is REALLY deep... here throw one these big rocks and see how long it takes." Again, there was no noise after throwing in the rock.
"Look over here, there's a railroad tie in the weeds. Lets throw it in, its gotta make a noise." The two drag the heavy tie over to the hole and heave it in. Not a sound from the hole.
The two stand there, amazed, when suddenly, out of nowhere, a goat appears, running like the wind.
It rushes straight toward the two men and then past them, running as fast as its legs will carry it. Suddenly it leaps into the air and into the hole. The two men are astonished by what they've just seen. Then out of the wood comes a farmer who spots the men and ambles over.
"Hey .. you two guys seen my goat out here?"
"You bet we did! The darndest thing we've ever seen. Came running outta nowhere like crazy and just jumped right into this hole!"
"Nah", says the farmer, "Couldn't have been my goat. My goat was chained to a railroad tie."