Meet Anyone Famous?

My sister, her husband and their granddaughter are taking an "historic" tour of the east coast.  The granddaughter is grade school age, and they wanted to take in some sights.  Philadelphia, Boston and New York City.  My sister texted me the other day on the trip and said she road an elevator with Terry Bradshaw, legendary quarterback of the Pittsburgh Steelers.  She said he was very nice and looked to be in good shape.  That got me to thinking about what famous person you just happened to run into.  I've met a bunch but only because I'm in radio and it's planned.  Just to stumble on a famous person has not happened to me.