The Sale / The Routine

S4, E205: Gumball and Darwin are devastated to learn that Mr. Robinson -- their favourite person in the world -- is selling his house and leaving town. When they realise that making some final happy memories with Mr. Robinson is not enough for them, they decide to stop him leaving... by sabotaging the sale./Mom and the kids depart for their hard day's work, leaving a seemingly lazy Dad half-asleep on the sofa. Mom has given him one very simple job: buy mayonnaise. However, Dad manages to turn this mundane task into an epic quest, showing that his daily routine isn't as inactive as his family imagine.