I was young and dating an older man. In the morning, over breakfast, he watched me cut an apple with a knife. I sliced it with the knife toward my palm.
"You know you're not supposed to cut like that," he said. "It's dangerous." I rolled my eyes.
"It's the right way to pare an apple," I said.
I didn't bother to tell him this, but the way you hold your thumb on top of the apple as the knife goes through provides enough pressure to give you control over the knife's movement.
I believe in many things that look dangerous but are worth doing.