Fascinating

On Star Trek: The Original Series, "fascinating" is a word Mr. Spock used when confronted by something unexpected. How often did that happen in the series? More than once an episode, at least. Merriam-Webster defines the word fascinating as "extremely interesting or charming, captivating." I doubt Spock would use it to mean charming, but since the character is supposedly immune to human emotions (which wasn't quite true), we will assume he finds all thing extremely interesting.  

Here we have incidents that Spock found fascinating in a supercut from John DiMarco. (via Geeks Are Sexy)