Original Commentary

Because we did this with our wedding presents, that's why. I'm still not sure how we figured everything out. And to answer your question, it was a sleeve button. Brisbane was having trouble getting his shirt off, so Kimberly decided to give it a tug, and the button popped off - Terrence

Modern Commentary
Yeah, I'm going to overrule Original Commentary Terrence here. It was a button from the front of the shirt. She ripped a dress shirt clean off of him during the honeymoon because she wanted him naked right then.

Seriously, why did I bother writing a joke about Kimberly unwrapping Brisbane if I was just going to undermine it in the comments? Was I just being contrarian? - Terrence