Trigger Hurt STool?

My friends and I sometimes build obstacle courses for each other, and I was thinking that it would be kinda cool to give props an insta-kill kinda deal. like moving walls, flying objects, and the like. Would this be possible to make? And if so, would anyone care to make it?

So a tool that enables instant kill on contact with whatever prop you use it on? Kinda like anti noclip but without the noclip part?

Cue lua master here
cue my exit here

Ill let someone with more knowlege of lua take over now, ive done enough thinking.