"La vengeance est un plat qui se mange froid" -- Revenge is a dish which is eaten cold. This is attributed to Pierre Ambroise Francois Choderios de LaClos in "Les Liasons Dangereuses" (1782) who either got it from a Klingon, or was a very popular writer among Klingons—in translation of course.incognito said:"Revenge is a dish best servered cold"
Old Klingon proverb