Once Adam Cowan and I received each others puzzle cores. His was 12 armed and mine was 8. I stared long and hard convincing myself it wasn't mine.
I remember that! I was just starting to assemble an Identity Crisis
puzzle and I noticed that the core was short a few arms... Luckily this community is small (even smaller when that happened), and I knew Jason was working on his Compy Cube at the time which matched the number of arms in the core I had.