After all, it was buried deep in a speech that the former Federal Reserve chair thought would succeed only in putting Greenspan's audience to sleep.
Wow, was she wrong.
In fact, Greenspan's observation about the go-go 1990s stock market remains perhaps the most quoted line ever from a Fed chairman. But when Yellen saw a preview of the speech, which Greenspan delivered in a televised appearance on Dec. 5, 1996, she was unmoved.
"He showed it to me in advance, and he asked my opinion, and ... I think it was something like page 26 of this speech," she recalled Tuesday in a question-and-answer session with Ben Bernanke, Yellen's immediate predecessor, at the Brookings Institution, where they are both fellows.