Andy plans pranks for April Fools Day, but then gets invited to Lori's birthday / H.A.P.P.Y. initiation party. She won't take no for an answer. He finally gets a chance to kiss Lori but then loses it because of a bet with Danny, where they decided to see who could stuff the most gooey chewies into their mouth.
Andy and Danny prank call several people claiming to be the local DJ in charge of the "Beat the Bomb" contest. One of the people they prank, Martin, takes it seriously and thinks he actually won $512. To avoid embarrassing him they have to raise $512. The method they use: they claim that "Bumpo the Monkey Dance Dancing Monkey" is sick. Andy has to dress up as Bumpo and act sick.
101 Underpants: When Andy loses his pants in front of the whole school, he decides to "pants" the whole school. Playing Dead: Mrs. Larkin has signed Andy up for the dunking tank with out him knowing. To get out of getting dunked and getting grounded, Andy plays dead. Doing this almost gets him buried.
Andy tries to evacuate a whole train car by stinking everyone out. That fails so he has to resort to other means including pretending to vomit with the aid of corn relish. Next, to get out of having to buy food for Lik and Leech, he decides to "test their endurance" through a drinking contest. Andy has to much to drink and has to find a restroom.
Very Bad Idea: At the school science fair, Andy steals a weather balloon for a joy ride. Cockroaches: At Mr. Larkin's boss' house Andy is not supposed to pull any pranks. While there Andy finds cockroaches in his salad. They get into his clothes, so he goes to the bathroom and strips down. Then his clothes go flying out the bathroom window.
Andy's sister Jen is running for a position as school president. Andy doesn't want her to win so he convinces someone that Jen has the hots for, Craig, to run against her knowing that she would not have a chance against the most popular guy at school. He gets tired helping Craig out and decides to run for a position himself.
Road Trip: The Larkins decide to go to the carnival, on the way Andy annoys them, they turn around and leave him at home. He is determined to go to the carnival no matter what it takes. He gets there and surprises his family in the middle of getting their picture taken. Snow Job: To get out of taking an exam and going to school, Andy with the help of his friend Danny and pizza delivery man Mush, trick Principal Derosa into thinking a blizzard has hit the town overnight.
Andy tries to get two of the school's bullies, Lik and Leech, to dislike each other. Andy first steals Leech's hat, "Nubby," and plants it in Lik's locker. To keep this prank going, Andy must now convince Leech that he is tricking Lik, and Lik, that he is tricking Leech. At the same time, Danny is getting Andy's plus his worth of picking on. Andy must decide between pranking Lik and Leech, and friendship.
Little Foot: Andy, with the help of his friend Danny, trick everyone in the town into thinking there is an actual "Little Foot" monster, and that this monster is actually stealing everyone's socks. Grandpa Crazy: Grandpa Larkin is in town, and Grandpa wants Andy to look after him. Lots of strange things happen around the house and the family blames Andy.
Andy tricks Lik and Leech into thinking Craig has the answers to the big standardized test, and he tricks Craig into thinking Martin has the answers. Eventually he confuses them all, and when they find out it was him... well, let's just say being hung up in his underpants and getting splattered with water balloons isn't out of the question.
Andy notices that his parents seem happy when they think about winning the lottery, so he makes it seem like they won. Unfortunately, things get out of hand when Jen buys a convertible to show off to Craig, Mr. Larkin decides to tell off his boss, and Mrs. Larkin decides to donate $100,000 to a charity, not to mention buying tons of stuff and renting a vaction cruise. Andy now has to stop his parents from making a horrible mistake.