When I walked into the kitchen after exercising the other morning, Peter was organizing breakfast, as he often does. I pointed out that he had one slipper on and one bare foot. He hadn’t noticed, and he didn’t feel the need to do anything about it.

Moments later, as we sat at the breakfast table, I noticed that his hand holding a knife was dangerously close to his right eye. I suggested rather urgently that he be careful.

“Why?” he replied. “If I only have one slipper, why would I need two eyes?”  

End of discussion.