Sorry. Myth busted. Airline toilets are built with a shroud that provides an air gap. Even putting their simulated giant butt (really!) directly on the bare bowl, just a slight shift was enough to break the vacuum. 3 psi isn't enough to suck your insides out either. Adam actually tried it himself. He laughed like crazy but was unharmed.

As for bare feet, I might get disgusted by proxy, but nothing they track in on their bare feet is going to affect me any more than the stuff tracked in on shoes.