Is it possible to have a marriage without ever having one spat or fight or disagreement?

Is it possible to have a relationship without ever feeling anger toward a partner? I know someone who claims to have experienced this in his marriage, and it doesn't seem humanly possible. To me, it seems in any relationship as close as a marriage relationship is, there will be conflict of some sort --- it seems unnatural not to ever disagree with a spouse. Do you have any thoughts about this? I am very curious!