Iframe the quote and noindex the page it displays.
Yah, that was my Option B :(
why do you bother putting "a quotation on a subject that's got nothing to do with the page content" on the page
Because the quotation illustrates something that is relevant to the page.
By analogy: those who have snooped know that my Panda Page consists almost entirely of very, very long-tailed searches that led people to my site-- in most cases wrongly. So, almost by definition, a search leading to the page would not be answered by the content of the page. But that's an entire page; a comprehensive noindex is the easy and obvious fix.
In principle: Eeuww. But in this specific case that might really be the best option. Hadn't thought of it-- due, of course, to the "Eeuww" factor ;)