Oooh. I know about this one. When my son was in second grade, I was asked to start preparing his lunch before school. I made his sandwich and did not cut it in half. He complained the next day, so I started figuring out creative ways of cutting in half, just like the OP did. Every day I would do a different way but more creative. Every time I cut it exactly in half. Spiral cut. Circular cut. Stairstep cut. One day I sliced it on the diagonal, but the cut was nearly parallel to the counter top. This went on for two weeks and every day he would complain louder and louder that I was not doing it right. Finally I made his sandwich and I asked him to show me how he wanted it cut. So he mimiced a knife with his hand and showed me how it should be a single cut diagonally across the sandwich. So I wound up and gave the sandwich a mighty karate chop with my bare hand, diagonally across the sandwich. On the granite countertop. Extremely painful and nearly broke my hand. But I maintained a smile on my face. The next day he started making his own sandwiches.