I wasn't familiar with "Porcupine Pie" so I looked it up to see who sung it. As I was searching, I came across a site called songmeanings.com. On their entry for Porcupine Pine, the sole comment (from 7 years ago) is the following: "Don't you dare ask Tom Scharpling of WFMU 90.1 NJ fame to play a request, or you'll get a heaping plateful of Porcupine Pie!"
I wonder if it was Tom himself who posted it. It was pretty funny to find, nonetheless. I'm still making my through the archives, so I wasn't aware that was something Tom used to do.