The Marvelous Misadventures of Flapjack (2008)

S02E18 Mind the Store, Don't Look in the Drawer

Dr. Barber entrusts Flapjack and K'nuckles with the responsibility of watching over his barbershop and clinic, but he sets one crucial rule: they must never open a certain drawer. This only heightens their curiosity about what secrets it might hold.