In one episode, Lulu and her friend (I don't remember her name) decide to open a lemonade stall. Then Tubby and his friends decide to open one too. Tubby tries numerous tricks to make sure everyone buys his lemonade. One of these is pouring ink into Lulu's jug of lemonade. When Lulu sees the lemonade, it has turned black (obviously because of the ink). But when the camera pans out so that you can see Lulu's jug AND Tubby's jug, Lulu's lemonade is yellow again! Then when it returns to Lulu, it has once again turned black.