In an appearance on Meet The Press, Tom Brokaw asked John McCain to respond to Colin Powell's endorsement of Barack Obama. He replied that he's "very, very happy to know that five former Secretaries of State who I admire enormously" have endorsed him. He then struggled to name all five.
He does okay until the end, at which point he can't remember the name of the fifth former Secretary of State who endorsed him. Later, when the topic of conversation has shifted to something else, McCain finally remembers who it was (George Schultz), and interrupts Brokaw to tell him.
I was proper confused the first time I saw the clip, because the exchange at the end goes like this:
Brokaw: Now, Senator, we open today with a, uhh--with how you're doing in Iowa. The Des Moines Register has endorsed--
McCain: George Schultz!