Here's a really freaky story. Four girls in my niece's class broke their hands or arms in the last ten days. The teacher decided to have a sofer check the mezuzah of the classroom. He checked it, and saw that the letter yud in ידך was missing! They announced this in a WhatsApp group to the parents... and then, later that day, before the mezuzah had yet been replaced, my niece broke her hand!