Actually, in my family, any song is fair game..I am always amused that while most kids in my son's Kindergarten class were singing Old McDonald's Farm, mine was singing "What Shall we do with a Drunken Sailor!"..Actual verses like "shave his belly with a rusty razor, or homemade verses we made up like "Throw him to the sharks, and he'll walk on water!" make singing with your kids even better! Now that they are young adults, I see them singing to other kids the same way and they've told me that our times together were some of their fondest memories.