Get ready for some serious cocktail inspiration (or just a strong urge to get to happy hour as soon as possible tonight). Glam [1] of Mode Media [2] released a video on its YouTube channel [3] that traces the most popular cocktails over 100 years. From the sweet Manhattan of 1915 to the spicy Bloody Mary of the 1930s, cocktails have certainly evolved with time, and yet some of the most classic remain the most popular today — the defining cocktail of 2015 might surprise you. Watch bartender Adam Delaney whip up the boozy drinks at American cocktail bar Tradition [4] in San Francisco, and then try your hand at our three-ingredient cocktails [5] this weekend.