http://www.boingboing.net…lephone_nu.html
Following on quite nicely from that, a great story about a university switchboard was allocated all the numbers in the 666-xxxx range. Amazingly, it was a Jesuit univesity in San Francisco, which suggests someone somewhere has a sense of humour. In the dept. that got the -6xxx numbers, the boss chose the number 666-6666 for himself, only to find this had its downsides.
As you can likely imagine, there were many jokes and good times to be had with these numbers. And some weird lunatic prank calls, though not a lot. But what drove my boss crazy most of all about having that fateful number was the amazing number of “googoo gaagaa” calls he received. You know, those calls you get when an infant has gotten a phone off the hook and has inadvertently dialed you up and is cooing and babbling into the phone? Well, maybe you don’t, but trust me, if you ever get a phone number with all of the same digits, you will. Apparently pounding repeatedly on the 6 button is a fairly easy thing for a baby to do.