Up Periscope
I once convinced a friend’s particularly gullible ex that a periscope is “that little red button that nobody’s supposed to push, ever.” My reasoning? Peri was a prefix meaning around, and scope means “to kill,” which is why the mouthwash has that name – scope kills germs.
The logical conclusion was that if you push that button, everybody around you dies. Story credit: Reddit / TreeStumpin