This is only very short but I really must ask:
Suppose Tip-Top (or Buttercup or Helga's or whichever bread manufacturer you buy from) errs in their baking or packaging and you happen to buy the faulty product. You decide to have a few pieces of bread for lunch so you reach into your newly-bought bag of bread and extract 2 slices. NB: at the time, you know full well and openly acknowledge that you are NOT "making" lunch but simply whacking some bits of bread together. On arriving at uni, you pull out your lunch and take a bite. A very open-minded person would not be particularly surprised to find that the error in manufacturing consists of the fact that a piece of cheese has accidentally been inserted between those very slices which you unwittingly selected for lunch.

Voila! A cheese sandwich!!!!!!

While I know that this may not pose any threat to the debatable definition of a 'made' lunch, I thought it might amuse you to give it some thought. On further reflection, it must also be asked: what happens if the accidental piece of cheese was wrapped in plastic, thereby forcing you to manipulate the lunch before consumption?

*sigh*
It's a funny old world we live in, isn't it?