"Ah...that's different. Some Cybertronians are like that about the air, they're happier there than anywhere else." Megatron smiles. "I thought perhaps your ...mentor? guardian? had been alluding to some bizarre experimental thing. Humans in our universe have been known to experiment upon us, when they've had the chance to..."

That's not so pleasant a thought, but it's true, and it's been so long since he heard about it that his expression is pretty much neutral.