I've considered doing this, but live in a unit, so not sure if the property owners would appreciate the holes
I don't think they would appreciate walking in and wondering why you have a bomb connected to your ceiling!
Thats why you attach an LCD with a countdown and a message saying "Leave a good house inspection notice, or don't trip on the pressure pad under the front door"
Anyone else in your house? I don't think the other people in my house would let me do anything like that!