My SIL and brother were moving from Tucson to another state. SIL was pregnant at the time. She's, um, high strung at the best of times, and had a tough time with pregnancy hormones. So her mother, who lives in another state, got her all worked up about hantavirus because they lived in the southwestern US and everyone there was exposed to hanta and you would diiiiieeeeeee immediately. (hantavirus, from what I understand, is primarily carried through mouse excrement; SIL kept a very clean house and there were no mice anywhere).
So we're all out for dinner as they get ready to move, and SIL says to DB, 'As soon as we get to the new house, we have to wash all the dishes and cookware in the dishwasher to kill the hantavirus!'. DB says, ok, fine, we'll do that.
SIL: No! You don't understand! We have to wash EVERYTHING!!!!!!!!
DB: OK, you just tell me how you want to handle it and I'll help. We'll run everything through the dishwasher
SIL: You're not getting it! We have to wash everything!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
DB: Right, we will. I'll do whatever you need me to do
SIL: YOU'RE NOT LISTENING TO ME! WE HAVE TO WASH EVERYTHING!!!!!!!!!!!!!!!!!!!!!!!111
DB finally had to tell her rather sharply to let it go, they'd talk about it later.