In 1844, there was a case of hysteria in a French convent of nuns. One started meowing and after a week all the nuns were meowing harmoniously in the afternoons. It didn’t stop until neighbors called soldiers. – WTF Fun Facts
Source: https://archive.org/details/epidemicsofmiddl1844heck/
Weirdly, this does not surprise me. However, I am surprised that more nuns don’t do strange ass things like spontaneously start to recite the alphabet.