Minecraft drawbridge (uses doors, not trapdoors)

Note - Released pre-trapdoor update, meaning that this system is now pretty obsolete. A drawbridge that i made in minecraft, using iron doors that in one state form a perfectly safe, if thin walkable route, however in another create a two block wide, unjumpable (due to the low ceiling) gap. if you do fall however, you can just swim outside, and try again :P oh and yes i did do this on the free fraps, which only lets you record 30 second fragments at a time, so that is why it occasionaly jumps to a (slightly) different view, because i had to stop and start recording)