When I got my first phone number (circa 2000?), I asked for something memorable.
The operator rattled off 0427 151 181, which sounded fine enough. Then he pointed out it was my birthday - 15/11/81.
I think that’s pretty nifty, but what really impressed me was when I met my beautiful wife several years later - because her birthday is 27/11/81, so my phone number actually includes her date as well as mine.