on a flight from iah-slc once, i was in 21a. the flight attendant goes to 22a and says my first name to the guy and says he has an upgrade. the guy goes up front. i told the attendant that i thought that upgrade was for me. sure enough it was. so they pulled him out of first and gave me the seat. the flight attendant went to the wrong person. if i had not heard my first name spoken, i would have lost out.