OK, according to Reddit, the bride's shoe has been stolen and, in order to get it back, the groom has to perform various stunts to get it back. In this case, it's an amazing dance-off.
Now, I can't 100 percent confirm this—I know approximately one word in Russian, and it is for "belly button," which I am pretty confident is not said in this video—but Livescience reports that holding a bride for ransom from her husband-to-be until he does a bunch of silly things is definitely a tradition in Russia.
Anyway! Take a look at this—the guy definitely goes above and beyond!
What do you think? Ooh, and does anyone with Russian knowledge want to weigh in here?