I feel your pain!!! An experienced sewer but at the time-new to rotary cutters and quilting. I had taken a quilting class-during which our class was warned of the dangers of these tools. I even remember thinking "good point--must committ to memory!"
Well --as I worked on my homework one afternoon and being in a bit of a hurry, I sliced the the top of my middle finger almost completely off ! As I ran to the kitchen sink with my arm in the air--all I could do was cry and mutter "how could I be so stupid?!?!? I know better!" DH was impressed that although tragic I left no blood trail and my finger healed after a few weeks! I did hang my head in shame and lifted my bandaged finger in the air when I returned to class and gave the statement "Teacher was right! They are sharp!"