Been laid off twice.
First time was early in my career - 1/3 of the company got laid off. A couple of days before management had said "we're all ok, keep working!"
Second time was many years later - big company that had offices all over the world closed our small engineering office. To get our severance package we all had to stay for the two weeks to train the people they flew in from the China office that were taking over our projects.