You know the type of irritating, mundane argument most couples have.

Step 1. Let them win, and think that you have conceded.

Step 2. Wait. Its not over. But she doesn't know that.

Step 3. At the first opportunity, suggest a romantic shower together.

Step 4. Timing is key, wait until she starts washing her hair. Maybe offer to do it for her.

Step 5. When she tilts her head back and closes her eyes to rinse out her hair..

Quickly pee on her toes. She won't notice because the water is warm.

End result: She's happy she won the argument, but the ultimate victory belongs to you, not Mrs Pissy Feet.

It's a victimless crime.