Ah, just what I always suspected: Spock is really Italian.
A vidder from Rome presents here all the times Spock says "Fascinating"--in Italian! And it sounds better, too. If you go to her site [click on the youTube icon on the vid] she lists all the Italian names of the episodes, which is kind of fun.
I've also been chatting a bit with an Italian vidder from Florence who put together "star trek e la presa vulcaniana di Spock", aka Spock's Vulcan nerve pinch (but the clips are in English).