In a military training camp some recruits get educated in parachuting. After some weeks of training on the ground they have to do their first jump.
Before the jump the instructor recalls, You leave the air plane, count till three and pull the cord. The parachute should open then. If it does not, pull the emergency cord. Then the emergency parachute will open. On the ground there is a lorry waiting. We will meet on the lorry again. Good luck!

The first recruit jumps, counts till three and pulls the cord. Nothing happens. He pulls the emergency cord. Nothing happens. The recruit is not surprised and says, As far as I know the army, I bet the lorry will not be there, either.

Joke found on http://www.doorseva.com