You can now chain configurations using 'Then'. You can read more about it in the FakeItEasy documentation for changing behavior between calls.
This is an example:
public interface IFoo
{
int Do();
}
[Test]
public void ThrowsFirstTime()
{
var fakeFoo = A.Fake<IFoo>();
A.CallTo(() => fakeFoo.Do()).Throws<Exception>().Once().Then.Returns(1);
Assert.Throws<Exception>(()=>fakeFoo.Do());
int t = fakeFoo.Do();
A.CallTo(() => fakeFoo.Do()).MustHaveHappened(Repeated.Exactly.Twice);
Assert.That(t, Is.EqualTo(1));
}