Of course, germ theory hadn't existed yet--Martha decides to blame this momentary startlement on the booze. "Yeah, germs. Alcohol stops them from breeding, and heat kills them," she explains. "Though there are different kinds of germs, and...this is probably a conversation best had sober, it's all going to seem like a load of rubbish to you."
Re: Martha Jones - OTA
Half-shouted across a crowded bar, too.