I'd use the Bare Naked Ladies' song, "If I Had a Million Dollars":
Sometimes Youtube disables music so make sure it's working before busting this out in class.
Most Youtube videos of this song have some improv when they talk about the tree fort and/or the Kraft dinner (macaroni & cheese as Americans like me say) so while you could use something like this, any lyrics you print out won't match that little part of the song:
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