A man is walking down the street carrying a 12-roll pack of toilet paper. People surround him, all excited: "Where'd you get that?" The man answers, "I just got it back from the dry cleaner's!" (source: Viktor Suvorov's fascinating Kuzkina Mat [1]) [1]: http://andrewnurnberg.com/book/kuzkina-mat/
Speaking of which...
Q: Why 2-ply toilet paper?
A: The second copy goes to KGB