Kirk invites the class to his super-fun backwards birthday bash, where everything is backwards, including clothes! The kids in Room 26 have a great time, but they are sad when they realize that Humphrey, Og, and Ms. Brisbane aren't on the birthday calendar. Everyone starts whispering and Humphrey can only make out a few words, but he thinks he knows what they're planning--a birthday celebration for Ms. Brisbane! But when Friday comes around, Humphrey...