Lion hell

I gave my son a snack this afternoon in a little snack cup with a lion on it. Here's the conversation that followed:
Him: There's a lion on that cup!
Me: That's right! What letter does lion start with?
Him: *thinking really hard*
Me: L-L-Lion...
Him: I don't know, Mama.
Me: L. Lion starts with an L.
Him: L...L...Hey, I know! That rhymes with what the hell!!!
Me: *looking down trying not to laugh but not succeeding* Yup, it sure does, buddy. You are absolutely right. Good rhyming!