This joke has a beard 2 meters long. It's best version was in a "Some features of national hunting" movie, the best Russian comedy of the past decade.
In that movie a Tu-22M crew carries a cow in a bomb bay, but the ground control is informed about it, and orders the crew to land immediately. Pilot explains with gestures to the bombardier that they have to release their "bombload", "cow away", and they land. When the ground control officers order them to open a bomb bay - the cow is still there, stretched like a starfish and frightened to death. One of the bomber crew says an epic phrase: "If you want to live - you could spread yourself apart even worse". (Sorry, in Russian it's funny, I just can't find right words
)
Anyway, it's one of the oldest VVS jokes...
Here is another one: During the Afghan war IL-76 crews had a little business. They smuggled little nice Middle-Asian turtles to Russia. Usualy officers gave them turtles and a small fee, they locked turtles in a box and delivered them to Russia. So, once the box ulocked in flight and turtles crawled all over the plane. Crew was in panic because they tried to hide away and could stuck the controls or break something. So they searched the plane and tried to put the turtles back into the box. The trick was that they had 20 turtles in a box before it unlocked. After they searched the plane they counted them and found out that they have 25 turtles...
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With respect,
Pavel Pavlov,
Commissar 25th IAP WB VVS