Conversation with an American tourist

He: Can I ask you what a loonie means?
Me: It's a dollar coin.
He: But why is it called a loonie? There's a picture of a duck on it-
Me: It's a loon.
He: Oh!
Me: You know, some people are saying we should scrap the loonie, but I say we should wait until he resigns as Prime Minister.
He: You know what a loonie means in America? It's a crazy person!
Me: Yes...