Minecraft how to build 4 mob traps

Watch the new mob trap video (its better) http://www.youtube.com/watch?v=xWmfIQZtDaA ================================================================ In this quick tutorial I show you how to make 4 yes i said 4 different simple + automatic mob killers, harvesters, traps, or crunchers, whatever you want ot call them. the first is a water/lava trap which I thing is the most efficient. the second is a underground drowning trap which is also pretty effective, probably the second most efficient. the third is an above ground drowning trap, it is the third most effective, the cool thing about it is you can make it really big, and then build a house over it. so while you sit inside, mobs try to get in but end up drowning. then in the morning you enter your basement and have lots of goddies there! The last one is actually kind of funny and also the easiest to make, but it is the least efficient. Thanks for watching (and reading)!