1) the nuclear bomb.
I would say that, because...
Even if you nuked a perticular area...
The clouds of toxic chemicals and radiation would be pulled around the globe, making people sick
2)Cluster bombs
Because like some of you said, many of them dont explode, and some person walks by and starts playing soccer with it... (we know the result)
3) The land mine
Tons of em never get stepped on, so afterwards some person walks by and gets blown up. I also heard that an elephant stepped on a mine. and half of its foot got shredded
poor animal
Although I do say this: Cluster bombs ARE pretty cool, and they could do some serious damage to the enemy.

