There was an old hairy story on those lines:
P/O Bloggs gets on blower to roast some underling at Group. Call goes to wrong extension, but Bloggs does not twig and launches into his spiel.
Deadly silence, then:
"Do you know who you're talking to? This is the AOC !" 
..... "Do you know who
you're talking to, Sir? .....
"NO!!!"....
"Thank God! "... (rings off).
(This, of course, was in the Good Old days, when the girls said: "Number, please", and a call couldn't easily be traced).
D.