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"How you talk, Huck Finn. Why, you'd HAVE to come when he rubbed it, whether you wanted to or not." (3.13)
The Widow's rules (i.e., society's) are arbitrary, and now we see another system of arbitrary rules: fiction. And Tom Sawyer knows what's up. Genies may not exist, but if they did, they'd definitely follow the rules.
Pap he hadn't been seen for more than a year, and that was comfortable for me; I didn't want to see him no more. He used to always whale me when he was sober and could get his hands on me; though I used to take to the woods most of the time when he was around. (3.3)
It's hard to tell because of Huck's casual tone, but this is pretty grim. A son who feels better off without his father? No wonder Huck doesn't feel comfortable in society. The #1 societal bond, between families, is nothing but a horrorshow for him.
Miss Watson she took me in the closet and prayed, but nothing come of it. She told me to pray every day, and whatever I asked for I would get it. But it warn't so. I tried it. Once I got a fish-line, but no hooks. It warn't any good to me without hooks. I tried for the hooks three or four times, but somehow I couldn't make it work. By and by, one day, I asked Miss Watson to try for me, but she said I was a fool. She never told me why, and I couldn't make it out no way. (3.1)
This is one of those fun bits of dramatic irony. We know that you're supposed to pray for things like kindness, grace, forgiveness, and maybe a nice harp waiting for you in Heaven. But no one's bothered to explain this to Huck, so he thinks prayer is kind of like making an Amazon wishlist and waiting for God to click on it.