Once, I was flying DTW/MEM and the flight was delayed. I got a little chummy (no naughty intentions... just nice conversation) with a woman in the gate area while waiting for the flight to leave, so I asked if there was room for a companion upgrade. . . the GA said yes. She was GLOWING!!! You'd have thought she won the lottery!! She had 2 free beers and couldn't wait to get home and tell her husband that she flew 1st class for the first time! It was just a fun little bonus to do a favor for somebody and the gate agent was more than happy to oblige!
Dave