The acid will leak out making the battery less effective and causing everything around it to get eaten up.
Get a jump start from somebody else, and then figure out what it was you left turned on or plugged in to drain your battery. If it happens again, replace the battery. By the way, this is why you should belong to AAA or another road-service club.
The car will then be unable to start.
No, not unless the ignition is turned on.
Nothing. The battery is sealed an no harm will be done.
it will arch out and melt the knobs on your battery and your cables
Make sure the Car is in PARK, if it is in gear like Drive or Reverse, the Car won't start even if the battery and starter are fine.
If the outlet is powered with the key off, then yes it will slowly drain the battery.
THE BATTERY WILL GO DEAD
they have to be recycled and they wont work.
Sounds like the battery has a dead cell
A very low (but not quite dead) battery will do that. It's the starter relay trying to work.
Usually written on a label on the battery which may be on the side.