Our brains are full of weird mysteries. Chief among these is without a doubt the mystery of why itching seems to be contagious. Why does seeing someone scratch, or even having itching mentioned, send some people into a scratching frenzy.
Well, it's possible that this isn't just some random coincidence or a figment of the imagination. It really happens, and scientists might know why (feel free to pause and scratch that itch).
Itching may actually be contagious. SciShow, in a video about the broader subject of itching, notes that one set of researchers on the subject gave a lecture to an unsuspecting crowd on the topic of itching. While that seems like a needlessly cruel mind game, both verbal and visual stimulus about itches got the audience scratching. Furthermore, it has not only been shown to be a reality for people, other researchers have proven the phenomenon with monkeys.