What was normal in your family that you later found out was something not every family did?

Couldn't think of how to phrase this but my god on my way to work this morning listening to the local talk radio show, there was a story of a guy that had a "poop knife" growing up.
The poop knife was hung up in their laundry room and was used, as you'd guess, to make larger works smaller prior to trying to flush. He thought or assumed every family had a poop knife and only found out at the age of 22 that wasn't the case when he asked his friend for the poop knife while at their house.
Anyone else have things similar to this from your childhood family? I'm so intrigued..


Source.