I love the idea of contagious yawning. Who's a sleepy baby? Everyone's a sleepy baby! Every uncontrolled, open-mouthed breath I take can be spread to all around me, forcing them to also expose the back of their throats in a mildly undignified manner, regardless of their level of sleepiness. The contagious plague of yawning can even leap across species from us to our close relative, the chimpanzee, according to research from Lund University in Sweden.