What started as a mischievous photo of someone serving themselves Coca-Cola and Pepsi at the same time has turned into a full-fledged trending meme. The origin photo went viral on Reddit in early December or 2018, and it wasn't until early January that it really popped off. The meme is generally used to represent our most contradictory behaviors and emotions, but some people have used it to make references to viral videos or cult songs. Here are some of the better examples of this fun meme.