(This can be enjoyed best if saved and displayed in text format)

There was a group of russian soldiers close to a high ravine. The sergeant goes close to the edge,
looks down, then turns around and says:

- Soldier Ivanov!
- Sir!
- Put yourself in this position:

O
*--------------.
| | |
| | |
| | *
| |
,--------
| |
| |
|
|
- Yes sir!
- Now jump!
- I'm sorry!!???
- I said JUMP, soldier!
- Yes sir!, (and jumps)

The Sergeant looks down to the abyss again, thinks for a while and says:

- Soldier Pyetrov!
- Sir!
- Move a little to your left!
- Yes sir!
- Put yourself in this position:

*
|
|
|
O |
,-----'
| | |
| | |
*----' | |
|--|
| |
| |
| `-----
|
|
|

- Yes sir!
- Now jump!
- Yes sir!, (and jumps to the void...)

Again the sergeant looks down, thinks and yells:

- Soldier Sidorov!
- Sir!
- Move yourself a little to the right and kneel!
- Yes sir!
- Jump!
- Yes sir!, (and jumps)

The Sergeant analyses again the situation and says:

- Soldier Strogoff!
- Sir!
- Put yourself in this position:
O
*-----------.
| | |
| | |
| | |
| | *
,-----------.
| |
| |

At that moment a jeep stops. The Captain gets up and yells:

Sergeant Tchebychevich!!!, this is the last time that I warn you! The next time I find you playing
Tetris with the soldiers I'm going to send you to Court Martial!