You know what really sucks? When you're arguing about something that can't be determined for a really long time (like, for example, whether your kid's pajamas will still fit by next winter, thus buying the next size up
was or
was not a retarded thing to do...)
So to solve this dilemma, you go buy a blank book that you can write down all the long-term bets in, purely for the purpose of going back months or years later and declaring your triumph. You may also choose to label the cover
The Book of Right in great big letters, if that's the sort of thing that invigorates your marriage.