Today I had a shoulder arthrogram - it's an MRI with contrast done by injecting dye into the joint. Before the MRI part, I got to watch the injection process on an x-ray. It took longer that normal because my shoulder joint was causing trouble for the needle and the doctor had to come in and wrench things around to get the dye flowing. The whole time I just prayed that it didn't all of a sudden get ultra painful (it didn't) and watched my shoulder joint on the x-ray. It got me thinking about joints and - I suppose, ultimately led to this drawing.