Funny or not - joke 3?

Two men are in the desert, searching for water, when they come across a deep well. they throw a small pebble into the well and they listen to see if they can hear the splash to see if there is any water in it. they cannot hear anything. they then throw in a larger stone, but again, they hear no splash. they then find a rock and throw it into the well. but still no splash. then they find a really big rock, and they heave it into the well. they listen, but all they hear is the sound of something running towards them. they look round and see a camel running headlong at them with a panicked look on its face. at the last second the camel leaps and jumps straight into the well. both men look at each other in surprise. shortly after, an Arab approaches and asks if anyone has seen his camel. the men explain about the camel jumping into the well, and the Arab replies, 'That's odd, because i left him tied to a large rock...'