My fav would be the free Reckoning TShirt when you send me one
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Seriously though, probably have several:
Original Subpop Nirvana Circles of Hell. That's te one with the 'Lipsmaking' poem on the back. Mines an original so has both the original poem, which I can't repeat because of the language and the Subpop logo rather than Geffen.
Crass - the broken machine gun one. Again an original from the 70s.
Rush - Hemispheres, again original.
I'm wearing a Mudhoney Birthday Cake/Reading Festival one today, which my daughter really likes. So much so that she asked me to leave it to her when I die. She also wants my Bomb Disneyland, Butthole Surfers and Dwarves band shirts when I die