Pour the melon liqueur in a tall glass, then fill with ice. Pour the vodka, sweet-n-sour, and pineapple juice in a shaker tin of ice. Shake, then strain on top of the melon liqueur. Float the Parfait Amour on top. Serve a shot of Goldschlager on the side for the gold at the end of the rainbow. (Be sure to swirl the bottle around a little before you pour to guarantee some gold flakes get in the shot.)