This comes from a site called Viral Quake, so I suspect it has been laboratory engineered for maximum virality. Take it with a few grains of salt. Still, many of these amused me.

2 pilots are served different meals and cannot share, this is done in case of food poisoning.
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Arm rests – aisle and window seat: Run your hand along the underside of the armrest, just shy of the joint you’ll feel a button. Push it, and it will lift up. Adds a ton of room to the window seat and makes getting out of the aisle a helluva lot easier.
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Do not EVER drink water on an aircraft that did not come from a bottle. Don’t even TOUCH IT. The reason being the ports to purge lavatory shit and refill the aircraft with potable water are within feet from each other and sometimes serviced all at once by the same guy. Not always, but if you’re not on the ramp watching, you’ll never know.
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Lock your bags, carry-on bags included.
Look online or in a travel store for TSA-approved locks. The TSA has keys to open those locks in case they need to further inspect them (and hopefully not steal from them). And most people don’t think to lock their carry-on, but especially now with load factors very high, more and more people are having to gate check bags. Once you drop your bag at the end of the jetway for gate-checking, anyone from a fellow passenger, to a gate agent, to a ramp agent has access to your bag.
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The majority of domestic flights have human remains or organs on them. I work below wing as a baggage handler. Watch out the window for long boxes that say, “Head” at one end… Oh, and I can fit 150 bags in bin 3 of a Boeing 737-300.