the fogger would take to long to "warm up"
wouldnt it?

fog machines take atleast a minute to warm up like mine its a professional one but some take 2-3 minutes or even longer. also the power would have to come into mind if you would run it from the car you would need an inverter and it would have to be a beefy one because fog machines tend to draw a lot of power. so if you can get past those obsticles it would be a good joke but it seems like a very time consuming (hiding the fog machine/inverter and wiring it up) and somewhat difficult for a joke. other than that go at it!

nah, easy stuff, got the inverter, and the inverter and fog machine ar eboth going inside the bumper which is hollow, and the switch just wont respond until its heated up so he starts driving, a few minutes later all this 'smoke' comes out, if it heated up instantly it wouldnt be as good, lol