[wanni]

2 explorers are standing in front of a big hole in the ground.
- Joe, how deep do you think it is?
- I do know Charlie, but if we put down a stone we will hear when it is arriving down and from the time it takes we can easly estimate how deep it is.
- Let us try, Joe.
They take a huge stone and they throw it down into the hole. After a while:
- Have you heard anything, Joe??
- Nothing Charlie, let us try with a bigger one.
They throw down a stone about one ton. After a while:
- Have you heard anyting, Joe?
- Nothing, Charlie. Look, let us throw down this rail, it will make a metallic noise which we can hear easly.
They take the rail and they throw it down....when.....a donky...running like a hell is diving into the hole.
- Joe, let us go away, there is some black magie around here.......
A farmer arrives and asked to the guys:
- Hey, guys, have you seen my donky aroud here?
- No...or better, let us say that we have seen one running and diving into the hole...
- That's not mine. Mine was holded against a rail.