When you open a fresh jar of peanut butter do you only work through one side until it is completely empty then start on the other side?
Or when you get those shallow tubs of hummus does it have to make it back home undisturbed? Then one of the baggers at the grocery store shoves it sideways into the bag completely ruining the symmetry.
Leftover pizza needs to be heated up in a pan in medium heat. Its the only way for the pizza to not become soggy, to the crust have some crunch on it and to restore the cheese melt.
I will argue with anyone in my house that goes against this!
Even better, damp paper towel over the slices, microwaved to heated through. Then while that's happening melt some butter in the pan, put the hot slices in the melted butter, cover with a kid and wait a few minutes. It's more work bit it's almost perfect if you feel like getting more dishes dirty.