P'ang Yun (740-808) was a well known Chinese Zen Layman.
He was once selling bamboo baskets. Coming down off the a bridge, he stumbled and fell.
When Ling-chao saw this she ran to her father's side and threw herself down.
Sometimes I am confused whether I am thinking thoughts, or whether thoughts enter from elsewhere. Because it is impossible to think a thought and recognize you are the thinker while you are thinking the thought.
Try to be aware of a your mind and at the same time try to recite something in your head. It doesn't work. At best it is an on-off switch (thought-thinker-thought-thinker...)