First dates, especially when we're truly excited about the person we're seeing, are palpitation-inducing experiences.
We all get that flicker and glimmer of hope that holy moly I hope this is someone I actually hit it off with and I hope that they feel the same way.
So we try to put our best feet forward. We clean ourselves up. We research the best restaurants in the area that are "first date appropriate." Maybe we even practice our first greeting in the mirror like a loser in some lame romantic comedy.