While hurrying to get on the school bus, Arthur and his friend unknowingly switch their lunchboxes; later Arthur finds out what surprise his sister had put into hers.

"Does Jim Panzee want to go for a walk? No! How about having a playdate? No! Not even to eat a banana? No! Grumpy Monkey just wants to say 'no.' Sometimes it seems like the only word toddlers know is 'no,' and Jim is no exception"--