Season Four, Episode Three
'Good God, Lemon, your breath! When did you find time to eat a diaper you found on the beach?' – Jack
In the episode "Stone Mountain," Liz and Jack go to "real America" (i.e. Georgia) to find a new TGS cast member. Liz eats a sandwich (no shocker there) that ends up getting her sick, which Jack gets a whiff of the next morning during an argument over Jack's proposed hire.