Scientific explanation?

Question

Any special quality of the metal could be responsible for this motion as shown in the video

http://www.youtube.com/watch?v=gVTiBWrhnx8

Answer 1

watch the video properly. the person actually managed to stop the recording and slip in another coin. camera trick. hahaha. watch the 12 to 14 second properly. he used sudden moving and stopping to make the video real.