This may be a difficult to explain, but bear with me!!
A close friend of mine appeared on the BBC quiz show "The Weakest Link" a few weeks ago. (He didn't do very well but that's beside the point).
Anyway, yesterday evening, he and I and three other friends of his were in the audience for the recording of a radio comedy show.
During the interval, this friend went out to get drinks. While he was out, we decided to play a trick on him (OK, I admit it, it was my idea).
We asked the people sitting in the row in front of us to suddenly turn around to him when he came back in and say: "Weren't you in The Weakest Link a few weeks ago? Didn't you get knocked out in the third round? etc."
Well, this woman in front of us put in an Oscar-winning performance and he fell for it hook, line and sinker -- lapping it all up, fully believing that he was so memorable that she not only remembered him but also what round he made it to. He spent the rest of the evening and journey home revelling in it. (And we could barely maintain our hysterics. Made the whole evening worthwhile.)
I was all ready to take the wind out of his sails by fessing up and bringing the joke to its conclusion, but the other guys are insisting that we keep it up till the new year!! He'll be insufferable till then but it will be worth it for when we tell him!
Cruel, I know, but very funny.