Sometimes you just need a big pitcher of Margaritas to pass around the room.  Here is a great twist to turn your margarita into a killer Pineapple treat.  Enjoy this one with a crowd.

Ingredients
2 cups lime juice, about 20 limes
2 cups white tequila
2 cups Triple Sec
2 1/2 cups fresh pineapple juice
Fresh pineapple slices, for garnish
Directions
Combine the lime juice, tequila, Triple Sec, and pineapple juice. Fill a cocktail shaker 1/2-way with ice and fill 2/3 full with the margarita mixture. Shake for 30 seconds and pour into glasses. Decorate with fresh pineapple slices and serve ice cold.