LOL! I've heard that too. It's like a big tube of pressurized recycled farts and miscellaneous stank.Used to have a friend that was an areonautical engineer, and she once told me the worse job was opening the door to an aircraft from a long haul flight...
She said the inital smell that hits really reeks coz its basically many hours of B.O, peoples gas, etc all being blown in your face at once...