When you have a fight with your significant other...do you shut up or blow up?

I would agree with all of the above... especially the last one!

Let the spouse let off steam, keep quiet, then STAY quiet. This will give spouse time to reflect on his behaviour which will not seem unreasonable to him compared with your calm demeanour... then wait for the apology ;)

... Unless of course u really have something to shout about, then stand your ground and fight your corner!