When I was nine, and a friend of mine was eight, we had the following conversation while listening to "American Top 40:"
ME: Casey Kasem just said Kermit The Frog's "Rainbow Connection" is number 40 this week.
FRIEND: Oh, good...So, that means it's the most popular song.
ME: Well, no. It's actually the 40th most popular song.
FRIEND: But it's called "American Top 40," isn't it?
ME: Yes.
FRIEND: So, it's the most popular song.
ME: No, it's at number 40, so it's the 40th most popular song. The most popular song of the week is the song at number one.
FRIEND: Well, I don't know about that.