Should Christians Celebrate Valentine's Day?

Flowers, chocolates, and cards are some of the gifts given during Valentine's day to show someone how much you care about them.  Have you ever wondered how Valentine's day came about?  Below is a video that will give you a brief history lesson.  Should Christians celebrate Valentine's Day when it really the origins of a pagan holiday? Is it a harmless tradition?  Please leave your comments and let us know what you think.