There's that increased heart rate, a release of adrenaline, and even dilated pupils. But the physical body doesn't actually connect emotions to a physical response, which means the fluttering heart you get from seeing a little girl projectile vomit a stream of pea soup into the face of a priest is almost the same fluttering heart you get when you see your true love across the room. Add in the fact that your body and brain aren't always on speaking terms, and the confusion between fear and arousal is so common there's a name for it: the misattribution of arousal. Of course, you could actually be attracted to the person sitting next to you … but you might want to think twice.
