This one references the time George went after the Pope in the one hundredth ZR strip
Every once and a while I like to go back to something really old to have it give either the present or the past some more flavor. It's one of the benefits of having a comic that has lasted as long as ZR has... it gives me lots of continuity to play with.
Speaking of playing with things... no, not that-- you've got a dirty mind. I've opened up a TeePublic store for shirts so I don't have to keep everything in stock, plus it gives me options for more styles and colors. I'm adding several designs to it with some that have never been on sale before.
Go check it out!