THE DIFFERENCE BETWEEN XXXI

What's the difference between:

1. Children and their grandparents?
2. A large, wild pig and a narcissist?
3. December and January?
4. The song sung by a couple who just inherited a fortune and the one sung by Mr. and Mrs. Potato-Head?

Answers:

1. Children will never offer to show you pictures of their grandparents. 
2. One's a colossal boar and the other a colossal bore.
3. In December we jingle the bells; in January we juggle the bills.
4. The couple sings "We're in the Money," and the Potato-Heads sing "We're in the Gunny." 

Credit: 
#4: Jeanne Wilson