So i thought i might try my hand out on some map-making

Its hard as crap.

So far, its been ok, got a fair objective, i made some cool dungeons, fair prizes
Its nice.

But one thing i keep running into is: How can I kill the player in new and awesome ways?

So thats my question for anyone who reads this: Post a comment/link/whatever about a SIMPLE (so not like gigantic redstone traps) Killing machine for players.

Try to avoid using too many modified spawners/command blocks.

This is my map: http://www.planetminecraft.com/project/paranoia---minecraft-challenge-map/
comment suggestions/bugs in it please!