I agree with the personal touch gets you to come in, BUT how many times can you go to the well before it drys up??? After a while it gets a bit old for the scheduler (or DON) to always be calling. Eventually, you just get resentful and don't want to pick up the extras. Let them wear someone out or... get a better system like this guy is talking about. Otherwise, eventually you have no one to pick up shifts regadless of the begging!