What’s the craziest/most expensive watch you’ve ever seen “out in the wild”?

I don’t mean at a meetup or AD.

One time, I was at SeaTac waiting for a flight and I noticed the guy next to me had on a Nautilus with a moonphase (maybe some other complications as well, I don’t know my Patek references). I wanted to talk to him about it, but he was clearly busy on his laptop. Still, cool to see, it’s the only nautilus I’ve ever seen IRL!