It's funny, though I must say it's fake. First they record the real hamster, but when it's about to start the image is cut just where the hamster should be (so we can't see it). Then we see a fast moving stuffed animal, and the take is cut again and mixed with other video with the real hamster. (I know it doesn't matter, this is an explanation for those who say it's real)
(I know it doesn't matter, this is an explanation for those who say it's real)