GMS Dog
I'm a huge fan of the Dog shirt, especially on a v-neck. GMS once stood for Galactic Mystery Solvers: which was our first company. This shirt was the catalyst that brought forth bike jerks. It also stands for Grumpy Mechanics Society. The Dog head logo was taken from a toy I had as a baby. If you're a grumpy bike mechanic, or you like dogs, or you love acronyms, get one.