"The Pothole" Season 8, Episode 16

Jerry knocks his girlfriend's toothbrush into the toilet, doesn't tell her, then cannot bring himself to kiss her. Kramer adopts part of a highway and decides to widen the lanes. Elaine pretends to live in a janitor's closet in the building across the street so she can order the flounder from a Chinese restaurant. George drops his keys into a pothole which then gets filled.