"Don't you know who I am?"

In late 1990s Shirley Bassey was at a check-in desk at Heathrow. A bit of a tense situation had developed about seat upgrades. No one was giving way. 

"Don't you know who I am?" says Ms Bassey finally. 

The check-in gives Bassey a pained look, and holds her gaze. A full 15 seconds later presses the tannoy button, "Check-in desk 14. Manager please. There's a little old lady here who doesn't know who she is."