i did encounter a bunch of famous people in my life, but most of them are only famous locally. so even if i tell you for exemple that i took a plane with pierre curzy, and meet the cowboy fringants before they were famous, not much chance that anybody would know what i'm talking about.
i guess the most internation encounter i had, was with former F1 pilot Jacques Villeneuve. he was invited in our store by intel for the promotion around the Montreal grand prix (at this time he was still active). i helped him to sit in the racing simulator that intel had installed in my departement, and we had a chance to talk to him and get things signed by him at the end in the backstore.