There are some really nice houses here and I’m sure they have fancy security systems.  But the less affluent seem to have developed their own fence-top security systems that are quite common here and appear quite effective. Some broken glass, some cement – voila! Instant crime deterrent. (Of course, in the US it would also be an instant invitation for the burglar to sue you for slicing open his artery as he/she attempted to violate your home.

(Click photo to enlarge)