When Bart, Lisa and the students of Springfield Elementary go on a field trip to the post office, Bart gets a coupon book as a souvenir, which he gives to Homer as a birthday present. Homer uses one of his coupons for a free wheel balancing at a tire shop, but is conned into buying four new tires for his car. While waiting for the installation, Homer meets Wally Kogen, a travel agent. The two watch a special on the Super Bowl while drinking at Moe's, and Wally explains that his agency is sending a charter bus to the game. To get free seats for himself and Bart, Homer helps Wally fill the bus by persuading many prominent male citizens of Springfield to sign up.