Twain uses superstition in three ways: to show that characters are simple people, for comic use and to indicate fate how does he make use of the third way in chapter 10?

Huck believes that the rattlesnake he brought into the cave would bring them bad luck, but marvels that their luck has been good (Huck and Jim). Jim notes that the bad luck will still come, foreshadowing Jim's being bit by the rattlesnakes. There is also the issue of the man Jim saw in the house, a man we later find was Huck's father.