Ok, 25 years and oh god how many thousands of miles on road bikes without a busted wheel. It appears that I finally done it.
Didn't notice a ping, just noticed a slight rubbing noise coming from the rear. Didn't break a spoke and no visible cracks in the rim, but when we got back to Angel Stadium I noticed two opposing spokes on the drive side of my rear wheel were ridiculously loose. As these are 24 spoke rims with paired spokes, I've been expecting them to break a thousand miles ago so I check both the better half's and my rims before loading the bikes each ride.