My man is trying hard to win “The New Yorker Cartoon Caption Contest." Readers submit captions and vote on the winner.Each winner receives a print of the cartoon signed by the artist who drew it.He’s tried for months, but never won.It’s tough coming up with new ways to keep him encouraged: “Keep trying Honey!They don’t know squat about funny --- and you’re funny… trust me!”Poor guy.Some day I’ll tell him the truth: there’s not much mileage left in knock-knock jokes.