That's an awesome shirt!
For shirts of shame, here are the closest I have:
I have one or two shirts from races where I volunteered and didn't race. They are 5Ks, so I probably did at least 5K later that same day anyway That counts, right? Eventually, they started making separate shirts for volunteers that say "Race Team". I took 2 of them one year. But I didn't take one this year, so I guess I'm even.
I have a shirt from a marathon where I was a pacer for the last 16 miles (there are reasons), so I didn't really run the full marathon. But there was a half marathon as well and it was the same shirt. But I didn't really run that course. I'm conflicted on this one????
Actually, I really don't care. Hardly anyone sees me when I'm doing endless loops of my small neighborhood and I wear more legit shirts on group runs.