Farthead

I overheard a conversation between my husband and the boy the other night:

Fellan: Look at my farthead!
Husband: Your what?
Fellan: My farthead!
(at this point, I was thinking that little-boy humor must have finally seeped into Fellan's class from the older kids' class)
Husband: What's on your head?
Fellan: No, look here! (pointing to his forehead)
Husband: Oh! That's your forehead!
Fellan: (thinking a couple seconds) It's my fivehead!!!
(much laughter all around...)