I'm only the one that thinks this thread is ridiculous?
How about the swizzle stick they serve in the drinks? It has an AC logo on it? Can I keep it?
How about the cloth napkin in J? Can I take home a set of 4? How about the cutlery?
Come to think about it why not take the life jacket under "your" seat?
For that matter why not take the seat cushion? It is "your" seat after all?
How about the cool looking smoke hoods and flashlight in the cabin? Don't see any reason you can take them too!
IF YOU HAVE TO ASK OR THINK ABOUT IT LEAVE IT ON THE PLANE!
(And no you can't take the vase in the MLL lounge either!)