1. Connect heavy duty extension cord to 220v outlet.
2. Connect extension cord to car body with alligator clips
3. Bury extension cord out of sight.
4. Energize.
Based on the police blotter around here, car thefts aren't as common as they used to be. Mostly pros going after luxury cars for the overseas market. They'll just tow the vehicles or hoist it on a flatbed.
The thing to do now is steal air bags and catalytic converters. Cats are particularly easy to take. All you gotta do is jack the car up and unbolt a few things. Probably won't even set the alarms off. Petty thieves will just smash and grab whatever is inside the car. GPS units are a perennial favourite, but they'll even take your change and CDs if they're that desperate for crack.
The joyriders still prefer your hot hatches. Especially "modded" ones. Subwoffers and third party stereos get stolen a lot. If you think manual will stop theives, be aware that sixth generation SI Civics (which only come as manual) are consistently rated as the most stolen cars in Canada.