I think the confusion was that the op was offering a little "snack" to the staff. Only enough was purchased for everyone to have one slice, a little taste. When some saw the pizza they thought, "Dinner!" and wanted more than one slice, which is appropriate for dinner. Now, in fairness to the greedy pizza girl, most people don't see pizza as a snack. It's more of a meal. A snack would be more like a box of muffins, which most would take just one.
She loved that I remembered that day.
This was before any of the children were served. She walked them down the street with a napkin draped over them and returned to the party. A little while later, she took 3 more. At this point, I asked her to please wait until all of the children got cake. She seemed miffed and explained she was freezing them for her lunches and she "wouldn't let them go to waste". Um, that was not my concern. My concern was to make sure everybody got a piece.
).

I'm not a soda drinker so that's what stuck out to me.
Gluten free, nut free, dairy free, mushroom free (texture issues) and well, don't forget about us vegans. 