I set up FreePBX at my work when we got rid of our old phone system. We don't need a lot of extensions, so I just used 1xx, 2xx, and 3xx for difference types of

I set up FreePBX at my work when we got rid of our old phone system. We don't need a lot of extensions, so I just used 1xx, 2xx, and 3xx for difference types of extensions and had plenty of numbers leftover for future purposes with those. So I figured to add a little easter egg if anyone ever calls the 666 extension: it plays a clip of Vincent Price's terrifying laugh from the end of Michael Jackson's Thriller. Well, a year or two after I set that up, I got a text early one morning from a coworker who said the phones must have been hacked because they're not working right and whenever they try to call anywhere they hear a scary voice. When I took a look, it turned out that something went wrong somehow and all calls were getting forwarded to the last extension I added, which was 666. Needless to say, people weren't amused by my intended easter egg and felt insulted by the laughter.