I just thought of something.
Here goes.
A claymore, no, not from Modern Warfare 2, real life beat that game to it. Now what I am saying here is. This claymore is destroyed after you plant another one. So lets say we're in a DM.
I plant a claymore.
Nobody walks into it.
I decide "Screw that one."
I plant another one.
Once that second claymore is planted, the first one is deleted.
So on...