In the episode "Chocolate with Nuts," watch the part where Spongebob and Patrick walk to the hospital. When they walk to the door,there are only two stairs that lead to the door,but when the fish says "They put glass in my arms and legs" or something along those lines,he then trips and falls. But the thing is,he slides down the stairs. If you look closely,there are about twelve stairs that he slides on when there were only two stairs to begin with!