Cherry was white as a sheet after Ponyboy told her about ?

Johnny's switchblade.

And Johnny, who was the most law-abiding of us, now carried in his back pocket a six-inch switchblade. He'd use it, too, if he ever got jumped again. They had scared him that much. He would kill the next person who jumped him. Nobody was ever going to beat him like that again. Not over his dead body...

I HAD NEARLY forgotten that Cherry was listening to me. But when I came back to reality and looked at her, I was startled to find her as white as a sheet.