One sure fire way of deterring a burglar from entering your house would be to program a tape recording of a married couple fighting and arguing. This tape could be activated when a robber breaks into the building. Suddenly he would hear obscenities, a man shouting irrationally at a woman followed by the sound of thrown kitchen items and much glass breaking. I have no doubt the burglar would think to himself, "Hmmm, this all seems a bit dangerous, maybe I'll try next door!"