Do you know why people serve a "signature cocktail" at their parties and events? It's because it means only having to buy one kind of booze and one set of mixers. Here we offer 80 cocktails to choose from. Go for ease and make one of them your "signature." Or go for variety and choose one from each type of liquor. Or be a completist and run through a bunch—dare we say all?—of the cocktails from one liquor. However you do it, your signature is bound to get a little wobbly.