At the search engine Dogpile, you can monitor in real time what people are searching for. I was just there grabbing a screen shot for something I'm working on when I noticed someone searching dogpile for "Washing mouth out with bar soap".
I got my mouth washed out with soap for saying this word. The simple fact is, I have not said this word in front of my mom since that day. In light of this fact, it's hard to argue against 'washing mouth out with bar soap.' Somewhere, someone must have said a dirty word.