The following is a conversation between myself and my 6 year old son...
Lil Muffin: "Mom, did you know that all twins don't look alike?"
Me: "I did know that! They're called fraternal twins."
Lil Muffin: "Yeah, because my friends David and Daniel do not look alike. David doesn't have a cocktail and Daniel does have a cocktail. Plus, David has a different nose."
Me: "Daniel has a cocktail?"
Lil Muffin: "Yeah, and plus, he has a different nose."
Me: "What do you mean he has a cocktail?"
Lil Muffin: "You know, that piece of hair sticking down in the back of his head."
Me: *hides snickers* "Oh...you mean that he has a rat tail."
Lil Muffin: *giggles* "Yeah. He has a rat tail."