I applied for a parking permit for the underground car park here at work, since I did use it several times this year when I had the use of Inka's car for several weeks this summer, and perhaps I might use it again in the future.
(Previously, I had simply put a little card on the dashboard with my phone numbers, which the lady at the reception had recommended in lieu of a permit when I said I'd only occasionally come by car.)
And the funny thing was, it listed my phone number extension here (2361) and a number: 999.
I asked whether that was some kind of dummy, and she said no, that was just a consecutive serial number.
So yay! Fun pattern.