Teachers Pet A Lick Is Still A Kiss ( S1 E4)

Leonard mentions to the cool kids that Leslie uses pink lemonade lip gloss with a hint o mint, which he had learned from Spot, but that turns into a rumor that he had kissed Leslie on the lips. It doesn t get any better when Principal Stricker threats him (along with Scott later on when he defends Leonard) to be sent to the School For Losers.