Well, upon starting the engine, we heard a loud bang and saw some smoke from under the hood. Shut it off immediatly, and found that a spark plug had shot out of the engine block and into the underside of the hood.
What kind of damage to the engine is likely here? It it simply a matter of putting the spark plug back in, or rethreading the head to do so, or is there likely to me some major things going on here. We had it towed to a Toyota dealer (unfortunatly we were out of town at the time), and will find out tomorrow, but would like to be prepared.