Well, I have to agree with jenn, that left-over pizza is vile. But in extreme circumstances, it CAN be eaten, re-heated in an oven, the next late-morning/early afternoon, if no other carry-out or delivery options are available and nobody in the house is capable of making bacon and eggs.
Yarb, cold pizza in the morning is manna from heaven. Microwaving cold pizza is an abomination. It gets all slimy and nasty. Leftover pizza should eaten cold (especially before noon), but if you must reheat it, use the toaster oven.
Cold Pizza for Breakfast Warm Coke to wash it down (Ahhhhh) Maybe a couple of anchovies Make this meal well rounded I want Cold Pizza for Breakfast And a pinch 'o cold spaghetti will do But there's nothin' in the world that I like better than Eatin' Cold Pizza with you.
– from "Cold Pizza for Breakfast", by Christine Lavin