Pizza discovery

We had free pizza at out meeting, according to our principle that free food brings people. I ordered it from the Treehouse, and thought the 5 pizzas I ordered were quite expensive. But when they were delivered, I made a discovery which explained everything.

I discovered that the Treehouse has its own special system of units.

In particular, a "Treehouse pizza" is not a pizza. Rather, ordering a pizza at the Treehouse means you get 2 pizzas! So, we had 10 pizzas, which was a little more than necessary, but it's all a learning experience I guess, and I have discovered a new interesting fact about the world, or at least, the world of pizza measurement systems.