The person suddenly in front of you, you know; however, you "choke" unable to remember who it is ~

U.S. Film actor, Douglas Fairbanks was driving back to his mansion, saw an Englishman of aristocratic mien and familiar face trudging along the road in the heat.  He stopped to offer him a ride, which the stranger accepted.  Still unable to remember the man's name, Fairbanks invited him in for a drink, and in the course of conversation attempted to elicit some clues as to his visitor's identity.  The Englishman seemed to know many of Fairbanks's friends and was evidently well acquainted with the estate, for he made approving comments on some recent changes.  Eventually Fairbanks managed a whispered aside to his secretary, who had just entered the room. "Who's this Englishman?  I know he's Lord Somebody, but I just can't remember his name.

"That," replied the secretary, "is the English butler you fired last month for getting drunk."

~ THE LITTLE, BROWN BOOK OF Anecdotes, Clifton Fadiman General Editor, 1985.