I need a good explanation for an upcoming scar.

[Rain Man]

This morning I had to shave, and since I follow the Mr. Clean look, I was shaving both my manly beard and my manly head.

I've done it a thousand times and only rarely nick myself. I don't know what happened this morning, but something went badly askew. The razor went rogue and I literally had to pull its twin blades of terror out of my head. It was like removing an axe or an arrow or something, right at the intersection of my somatosensory cortex and my parietal lobe. It went in so deep that I bet it impacted my ability to do math or use a fork or something.

It was a twin-blade razor, so I've got a pair of parallel cuts that are about 3/4ths of an inch long and maybe a quarter-inch apart. If I end up with a scar there for the rest of my life, it won't be impressive to tell people it was a shaving accident.

So keeping in mind the size and shape of the impending scar and its location, what's a good cover story?