I Love Lucy - "Moving" Bed
Watch the episode "First Stop", when the Ricardos and the Mertzes are in the cabin at the little cafe. The third time the train passes by, the Ricardo's bed is by the Mertze's bunk beds. Watch the back right leg on the bed. If you look very closely, you can see there is a string pulling the bed back over to the wall!
The episode of I Love Lucy entitled "First Stop"