“Ginger thought you’d be springing something on us,” replied Pee Wee, “and we were getting ready to duck.”

Billy looked aggrieved.

“You fellows don’t know a good riddle when you hear one,” he remarked scornfully.

“How do you know?” countered Mouser. “You never give us a chance to try. Spring a real good one and see how quick we’ll tumble.”

Billy looked dubious but took a chance.

“Well, take this one, then,” he said. “What is it that happens twice in a moment, once in a minute, and not once in a thousand years.”

The boys put on their thinking caps, but the problem was beyond them, and Billy strutted around with a triumphant look upon his face.

“Don’t seem to be any too much brains in this crowd,” he said, in a superior way.

“Give us time,” pleaded Mouser.

“Maybe it’s because it’s so bad and not because it’s so good that we can’t guess it,” conjectured Fred.