I love trick endings and Dan Savage tricked me but good! I won't spoil it for you because you WILL read this book (and you will love it)!
The wisdom of his 6 year-old floors me: Savage and Terry debate the whole wedding idea up to the end of the book. In a cheap jewelry store in Chinatown they consider last-minute rings (they're having an "anniversary-party-pretending-to-be-a-wedding-reception"but think about driving to Canada to actually get married). Savage asks his son for jewelry advice. Six-year-old DJ is already a metal-head who owns an Iron Maiden lunchbox, so naturally he gravitates towards the skull rings. His rationale cannot be faulted; he tells his dads that they plan to be together until they die, so the skulls would remind them of this. A matrimonial memento mori. I love alliteration, I love this logic, and I may need to switch out our wedding bands for a couple of cheap skull rings.