want to realy screw someones car up so it wont start, when you know you can’t be seen pop the hood of victims car and rearange the sparkplug wires (it doesn’t matter which end either spark plug or distributer) unless they are a mechanic or know what to check for (fireing order) they will have to have it towed to a garage to find out why it wont start and it will cost them big bucks to find out (just to find out someone switched the wires)unless they know a mechanic who will do it for nothing, but the chances of that are very slim this is better than putting something in gas tank because you get the fun of watching them try to start it time after time (as to sugar or anything in the gas tank the car will start and run till the tank or line gets plugged up)