"Trip up? They never do—that is, hardly ever," put in another pupil.
"They are the cleverest fellows in this burg," came from one of the other students. "Of course, everybody falls down once in a while."
"Just the same, it must gall them to think of how they were fooled."
"You bet."
Frank and Joe did not at first notice the air of mystery and the grinning faces, as they entered the school yard, but they were soon enlightened. A freshman, apparently very much frightened, came over to them at Chet's bidding.
"Please," he said, "my mother wants to know if you'll call at our house after school."
"What for?" asked Joe.
"She wants to know if you have any fish to sell."
Whereupon the freshman took to his heels. There was a roar of laughter from a group of boys who were within hearing. The Hardy boys flushed. Then Chet approached.
"Hello, boys," he said innocently. "You look sleepy."