The speed of emotion.

I've long thought that there was an emotional/intellectual dichotomy that went largely overlooked.  In college, I wrote an essay (not for any class) on how the "speed of thought" is out-done by the "speed of emotion."  It's why rollercoasters are scary even when you know they are safe.  Same for scary movies.  Intellectually, you know you're fine, but the emotion gets there first and is hard to uproot.