On an old "Gilligan's Island" episode, the castaways learn that a dangerous typhoon is headed for the island. They try to take refuse in a small cave, but find that there is only enough room for six of them. Gilligan volunteers to go out and brave the storm. The Skipper decides to go out and stay with Gilligan. One by one, all seven castaways leave the cave. When the typhoon hits, a bolt of lightning causes a huge boulder to crush the cave. All the castaways are safe as a result of not being in the cave.
If anyone is wondering "What has that got to do with The Simpsons?", they obviously have not seen the episode "Bart's Comet."