Man, 31st December 1999 was the night I accidentally set fire to a friend's dining room 😱
I was doing some IT migration work for London Underground, was renting a room in a shared house, and was single having dumped my previous partner of two years the month before. Seems funny now, but I wouldn't even know my current partner for another five months let alone have got it together with him (that happened about three months later still).
That was quite a major decade in the life-changing department 🙂