Electric Watermelon

1 part Tanqueray Sterling vodka
1 part Bacardi light rum
1 part Midori melon liqueur
2 splashes triple sec
fill with sweet and sour mix
1 splash grenadine syrup
1 splash 7-Up soda

Add equal parts vodka, rum, and melon liqueur in a tall cocktail glass with ice. Add a couple of splashes of triple sec (orange liquor). Fill to the top with sweet and sour mix. Add a splash of 7-up and grenadine.