[quote=@Penny]
More seriously though, does anyone really have a single favorite book? I can probably produce a list of my favorite books plural, but does it make sense to look at one book and say this is my favorite?
[/quote]
True, I can't even begin to guess my favorite book of all time.

[quote=@Odin]
The Hobbit — #gatekeeping here but any true Tolkien fan knows the Children of Húrin is the only good answer. ;) OK, but seriously, this is sarcasm, I’d like to meet someone who enjoyed the Hobbit. 
[/quote]
I thoroughly love the Hobbit, what's wrong with it? I honestly found Children of Hurin to be a little boring but still interesting.