i play parties in naples, FL a lot.... spend time at the top resorts... I see people that I recognize, or those who are obviously famous, but I really don't care enough to chase them down or take selfies, etc. Half the time, I don't know who it is... some bald tall wide pro athlete with a fine woman on his arms that just looks superhuman fine, always. They'll have 5 people milling around them with those smile-too-hard looks. I don't bother.
I suppose if I was in an elevator with Lee Haney or Bob paris, I might chat a bit. Older retired gents just passing the time. But chasing one down asking for an autograph? that's silly. I'd walk right past a brad pitt. I might see how much taller I am or see if he "makes a lane" for me, but aside from that, eh, nothing that exciting.
