Is now definitely my favorite drink. It tastes fizzy and lemony, and is great for crowds. It's a very simple recipe:

In a glass of ice, add:
2 oz Gin
2 oz Simple Syrup (or bar syrup, just a mix of equal parts sugar and water)
1 oz lemon juice

Then, pour club soda on top and stir the whole thing. Positively delicious. Very refreshing.