These became really popular just recently. Why? Who knows, but they are good.

½ shot Malibu coconut rum
½ shot crème de bananes
½ shot Midori melon liqueur
½ shot pineapple juice
1½ shots cold milk

Pour first 4 ingredients into a stainless steel shaker over ice. Add milk, and shake until well mixed and chilled. Strain into shot glasses and shoot.