Who was pizza???? Slice question.

So me and a friend picked up a pizza from Walmart the other day (don't hate, those are some good pizzas). We were sitting in his kitchen just enjoying our food when he noticed this on the back of the box:
We could not for the life of us let this go. 9 slices per serving? Who in the world would take the effort to cut their pizza into 9 slices? You would literally have to take a protractor and measure 40 degree slices.

I made a little sketch on his white board to see the minimum amount of effort it would take to make 9 even slices. Wow, look how easy it was and how accurate I was!

Here, I've added a diagram of how any regular person cuts their pizza:



So tell me, how do you cut your pizza? Tell me it's not 9 slices...