1x9 - Maniac Mansion

When Fred's experiment fails he gets very depressed and flashes back to his graduation when Casey gave him Success and Failure stamps. The rest of the family is singing the Edison Family song. Richard comes over and tries to convince Fred to move to Tacoma. The real-estate agent comes during dinner, and the family is shocked that Fred wants to move. Fred passes out and Casey chases the agent out of the house. To comfort Fred, Casey brings down a letter he wrote her 16 years ago. The show ends with everyone, including Fred, singing the Edison Family song.