At the very end of Chapter 3 Huck attempts Tom's advice of rubbing an old tin lamp with an iron ring. But, after a while of rubbing and no genie, he thinks to himself, "I judged that all that stuff was only just one of Tom Sawyer's lies. I reckoned he believed in the A-rabs and the elephants, but as for me I think different. It had all the marks of a Sunday school."
Why does Huck think this?