Reply #9: It's illegal here in MA. [View All]

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And from what I understand, it's illegal in many other communities/states as well.

Open invitation to car thieves is one reason, the possibility of a minor putting the vehicle in motion is another (mom leaves junior in car with engine running, junior is fooling around in front seat, junior puts car in gear, etc).

Another thing that one should consider is that if the vehicle is stolen (or accidentally placed in gear by aforementioned minor), and property damage, serious injury or death results, the owner of the vehicle could be looking at potential civil liabilities (and possibly criminal charges).