Why outlets spark when unplugging - EMF & Inductors

the statement about car ignition is somewhat incorrect.
Somewhere along the line the term ignition got used for two different things.
 There is the ignition which is the switch that that you turn with the key.
Then there is the ignition that is part of the spark system that ignites the fuel mixture in the combustion chamber.
what was referenced sounds like the points ignition system which was used before electronic ignition took over.