Imagine making a cup of coffee in a light, plastic cup and just as you reach for it...CAPTAIN OBVIOUS FLIES IN THE WINDOW. "That coffee is HOT!" he will proclaim "Touching it through a plastic cup could burn your hand and result in frivolous lawsuits where you get paid millions!"
So you grab the cup anyway. Because scientific obviousness has to be truthful obviousness.....or something that looks like it anyhow.