Nothing... But it probably wont let you start it until you put it back in park.
In brief, you will blow the engine.
car will jerk forward and then go in reverse
Car no move
No, as long as you come to a complete stop before you put it in park.
The car will not be ready for use so you have to warm up the engine or just ride it often
I assume you mean add fuel by pressing the accelerator. In which case the engine runs faster.
Almost always. Unless the airplane happens to be an ultralight, or the car happens to be a Hummer.
It is burnt.
The engine stops.
You have to get the engine looked at.
Your car has an automatic transmission which includes a "neutral safety switch" to prevent the car being started while the shifter is in any position except "neutral" or "park". This switch is activated by the shift lever and prevents voltage to the starter solenoid when the car is in gear (drive or reverse). This is a safety features that prevents the car from lurching ahead or backward while starting.