For me, finishing the Book of Mormon was kind of a surprise, because about a third or fourth of my paperback copy is just the index thing. I didn't realize how close I was to the end until I read "THE END".
And here are some old favorites:
"Don't eat [the cookie batter]! It has rotten eggs in it!" (age 5)
"mucus mucus mucus...." (age 10)
"Beware: the G is hungry." (age 10, while stuffling little magnetic foam letters on the fridge into the big letter 'G')
Jill: "Why doesn't anyone ever listen to me?"
Jody: "Ya gotta use catchy words."
two minutes later...
Jill: "Nude! Nude nude nude!!!" (age 11)
"It says, 'Glides on clear,' but is there anything that like, glides on purple?" (age 11, in the deodorant aisle in Wal-Mart)
(while Stephanie was in Taiwan for the summer)
Jody: "What garbage do you want to take out? Upstairs or downstairs?"
Jill: *whine* "Can we just leave it until Stephanie gets home? We can just like...uh...buy more garbage cans."