Video of Person Pouring Water Into a Glass is the WTF Moment of the Year

Here's one of those videos you'll watch over and over and over again. In the short clip above, the person is pouring water into what appears to be a glass, but as it turns out, it's not a glass at all.

According to the description of the video on YouTube, there will be a "how to" video published soon, but I'm the type of person who'll keep watching the video in hopes of figuring out how they did it before they let the cat out of the bag.