Little House on the Prairie - The Rocking Gravestone
In the night, when Charles is at his father's house and is lying down by his mother's grave, watch very carefully. When Charles sees that his father's house is on fire, he jumps up off the ground. At that moment, watch the gravestone carefully and you can see that the whole thing slides back and forth because Charles accidentally bumped something that was holding it up.
watch the episode, "Journey In the Spring"