【明報專訊】There have been a lot of guesses about the origin of this expression. It means "that would be pleasing" or "that's the right thing to make me happy". For example, if you told Charlie he just won the lottery, he'd probably jump for joy and shout, "That's the ticket!" Or if someone standing in the rain is offered an umbrella, he or she will probably say the same thing: "Oh, an umbrella! That's just the ticket to keep me dry."