It's No Joke!

SOMEONE'S PLAYING PRACTICAL JOKES -- BUT MEAN MR. DALY ISN'T LAUGHING!Nancy's class is going to the zoo on Friday, but first they have to survive a week with their strict substitute teacher, Mr. Daly. And things aren't looking too good: someone is playing practical jokes on him, and he's threatening to cancel the trip!First a sign saying OLD MEANIE is taped to his back. Then someone puts a fake go...