Jokes about snacks

Shortly after I entered the technical secondary school, I had a good time with the girls in the back row (I am a boy). During a class, they were stealing snacks (I don't remember what it was). One of the girls patted me on the back, glanced at the snacks on her desktop tissue with her eyes, then looked at me and motioned for me to eat. In order not to be noticed by the teacher, I grabbed the things on the paper towel and stuffed them into my mouth like lightning. Immediately, the girls' laughter came from behind me ... The people in front of me and I both looked back and saw the chubby girl taking the leftover stone out of her mouth and putting it on the paper towel. My face turned red at once, and I quickly spit it out. Her wink meant to let me throw the stone into the trash can.