14 Weird Things That You Can Catch and Contagious

Itchiness
This will have you scratching your head—or some other part of your body. Watching someone scratch makes people feel itchy and more likely to scratch themselves in response, reports a 2012 study in the Proceedings of the National Academy of Sciences of the United States of America. Seeing someone scratching herself activates the same areas of the brain involved in the physical perception of itchiness, probably because of our empathetic tendencies.