When I moved, in 1953, from rural NH (where the nearest phone was a wall-mounted crank type at the general store) to Springfield, Mass., (where we had a dial phone) of course I had to read that novel thing, the Phone Book. I have a vague recollection that the last entry was something like "Zzyzzy zzyggy zzyges", obviously concocted to always be the last entry.
I also recall, even more vaguely, that six years later, I noticed the same last entry in a phone book in Chicago. That made it more than just some local thing in western Mass.
Google doesn't turn up anything related from various spellings of the "Zzy..." nonsense name.
Anybody know what this (apparently) wide-spread last-in-the-book entry was?