"So that I can laugh at you for not knowing the answer."
"But that's nonsense," persisted Billy.
"Of course it is—we Scally Wags are all nonsense."
"Well, go ahead."
"What time will it be this time last week?"
"You mustn't say will it be, but was it."
"Have you ever heard this conundrum before?"
"No," said Billy.
"Well, you see I have—it's my conundrum and I guess I know what I ought to say."