Why?

Why is it that Rex can recite this to me in the car:
(From the Little Rascals)
"Dear Darla.
I hate your stinking guts!
You make me vomit!
You are scum between my toes.
Love, Alfalfa"

But when asked to sing "I am a Child of God" he is at a loss?
Do you think our priorities are a little screwy or is my child just naturally attracted to naughty words?