There's this scene in "The Rock," (I know) I think about way more than is reasonable. One of the bad guy Marines is showing off his custom motion detector that presents as a laser interrupt system, but is actually a vibration detector that will be disturbed when an adversary tries to cut the laser.
I'm thinking a lot about a sort of "Dead Man's Switch" for defense. I've long theorized about such a mechanism for ransomware, but never seen it in practice. For defense, I like the idea of a response system that doesn't require the ping-pong of SOAR.