Trampoline in Minecraft

Here's a simple trampoline I built. Also, here's how to build it.
ChangeEntities filter: http://sethbling.com/ChangeEntities
CreateSpawners filter: http://sethbling.com/CreateSpawners
SetSpawnerProperties filter: http://sethbling.com/SetSpawnerProperties
Get MCEdit: http://www.mcedit.net/

Music at the end is Cipher by Kevin MacLeod