"Benjamin Franklin, Teddy Roosevelt, and Winston Churchill ...all were proficient in Latin." And it was my Dad's 'foreign language'.
Another I like, post hoc ergo propter hoc, describing the logic fallacy, after this, therefore because of this. Also means, that logical fallacy is as old as the Latin language. http://en.wikipedia.org/wiki/Post_hoc_ergo_propter_hoc
(I see it comes up in the comments along with other good ones.)