On NYE 1999 we were on our way back down from a failed attempt to climb Aconcagua in S America - the highest mountain in the world outside the Himalayas at just under 7000m. 4 of our team made it, 16 of us didn’t for various reasons.
We stopped at a rocky stopover on the way back down after a 10hr trek, finished off with a mule crossing of a river. At 8pm we celebrated the arrival of 2000 in the UK (4hr time difference) and went to sleep. At midnight local time, I was woken from my deep slumber by the sound of fireworks set off by Argentinian guides and crew celebrating the local New Year - Mrs FB says I sat up in my sleeping bag, said “what the fuck!” and promptly went back to sleep.
Welcome to 2000.
Don’t think I can top that experience.