I've been working out here in LA since the early 90's and have met pretty much everyone.
My favorite time: Working in Mexico on Clear and Present Danger, we were in the middle of nowhere. Each night we would go to a bar and drink, nothing else to do. One night, over the course of an hour, I was approached by a local girl asking "marry me green card?" Over the next hour, I was approached by 7 more girls, asking the same question. Everyone at my table was razzing me hard and I started to get upset. I had no idea what the heck was going on. After the next girl approached me, I heard a table break out laughing. I looked over and Willem Dafoe raised a glass and toasted me, saying I was a good sport. He then picked up my tab for the night. In retrospect, pretty funny.
I've worked on over 40 films and Dafoe is the nicest guy I've met.