On one job they called in all the temps and told us that we were part of the "company cutbacks". I called all the agencies I was regestered with and told them I was available. That evening one called me and asked if I would be willing to go back to that job and company. They had just gotten the contract. I said yes and was there another seven months until the project was launched.
The security guard did a double take when I walked back in with my new badge the next day. :)