These are good and strong! One or two will do the trick, and you'll be thanking your designated driver. They don't have an overwhelming tequila taste, but you can just taste that they're strong. They're not quite as sweet as I was expecting, but still very good. (And also--Geaux Tigers!) The original recipe is from Ina Garten, the Barefoot Contessa. I cut the lime juice down to one cup instead of two, as the recipe reviewers suggested.
2 cups tequila
2 cups triple sec
2 1/2 cups pineapple juice
1 cup lime juice
Mix ingredients and serve over ice.