Season 6, Episode 9 - The Parking Spot Escalation
Aired November 29, 2012
When Howard buys a new car, the university gives him Sheldon's parking spot. Sheldon is outraged at the loss of his spot, even though he doesn't have a car, and starts a tit-for-tat war with Howard. The battle between Sheldon and Howard affects the whole gang, drawing Amy, Bernadette and Penny into the conflict.