Mitch Gibson said:
Please don't make us wait.
Well, since you asked.
You will need,
1 military smoke grenade. HC works really well. (Heavy concentration) White smoke is most convincing.
1 wire coat hanger
1 length of cord. I like the 550 cord
1 large nail
1 car
1 unsuspecting victim.
Make the coat hanger into a bracket with a loop that will hold the smoke grenade well underneath the car. Do NOT let the grenade touch the car, these things get REALLY hot. Keep away from any hoses, gas tanks, etc. I like to attach to a hole in the frame and let it hang to the ground.
With one end of the hanger make a loop and attach it to the car. Now take the cord and tie to the pin attached to the grenade. Tie the other end of the cord to the nail and stick it firmly into the ground or a crack in the pavement. Now go back and straighten the ends of the pin so that it will pull out easily.
Move away to an area where you can watch the fun.
What happens is your unsuspecting victim gets in the car, starts to drive away and when the cord pulls the pin, the smoke grenade will activate surrounding the car with a huge cloud of smoke. Driver now in panic mode will be running around the car in circles trying to find out why their car is burning up and possibly calling 911 at the same time. Do not let your laughter give away your position.