I think the name comes from a Saint Valentine, who used to marry people in secret because the Emperor thought soldiers shouldn't be married and made laws against it. Then he was put in jail and had a thing for the jailer's daughter and wrote her letters 'from your Valentine' which is where sending cards today comes from, but I don't know how we got pink everything and chocolates and whatnot.
Anyway, might be best to try a frappucino tomorrow, is the point.