I miss pizza.
I had to stop eating dairy for my son who has an allergy, and it has proven to be more of a challenge than I expected. It's not that I didn't expect it to be a challenge (because I did). It's just that I didn't expect to miss pizza this much.
Out of all of the things, why pizza?
Pizza is convenient. You don't have to plan in advance for it. Out of food in your kitchen? Order a pizza. 
Don't want to cook? Order a pizza.
Having friends over? Order a pizza.
Falling asleep while tryi...