The owner of this hamster intentially placed the hamster in a situation, where he/she made the hamster tip backwards and hamster's paws got stuck between the piano's keys for at couple of moments. This is NOT a natural position or environment for a hamster.
The most shocking part is that this video received 50,000+ views and a lot of POSITIVE comments. People write that this video is "sweet" and "cute" and completely oversee the fact that hamster's paws got stuck between the piano's keys.
This video also inspires a lot of people to do similar experiments to their hamsters. It's a mild form for animal abuse, yet it's still animal abuse.
Here is the video:
Direct link: http://www.youtube.com/watch?v=N9Vi1u0K