Season 5: Episode 119: Cowardly Lyin'
Carrie gets tickets to an opera but Doug doesn't want to go so he has Deacon help him lie to get out of it. Carrie catches him in the lie which prompts Doug to confess to a series of lies he's been hiding. Doug then tells Carrie that the reason he's been lying is because she's too overbearing. They both agree to be "supportive" of one another but this only leads to more problems.