Popcorn

In some Youtube videos, three or four cell phones popped popcorn in a minute. http://jp.youtube.com/watch?v=lg_dyD0Nsjw
http://jp.youtube.com/watch?v=AcLS2WJERQ0
These seem to be fake, but how were these made ? By electromagnetic wave ? Or, using vibration alert ? I want to know how the trick was done.

Last Sunday, I saw a cactus, Cereus peruvianus, for sale in a shop. The description of the item said that the cactus grows by eating electromagnetic wave. I did not buy the cactus, but I will get it next time. Whatever the videos are true or not, the correlation between brain tumor risk and cell phone use is still under discussion.