The worst way to reheat last night's pizza would be to do so in a manner that completely ruins the taste, texture, and safety of the pizza. Here are a few examples of what you should avoid doing:
Microwaving on high power: If you microwave the pizza on high power for too long, the crust will become rubbery, and the cheese will become overly gooey or even burn in some spots.
Putting it directly on the oven rack: Placing the pizza directly on the oven rack without any tray or foil beneath it can cause the cheese and toppings to drip down into the oven and create a mess.
Boiling it: Attempting to reheat pizza by boiling it in water is an absolute disaster. This will turn the pizza into a soggy mess and destroy its original flavor and texture.
Using a toaster: Reheating pizza in a toaster might seem like a quick solution, but it will likely result in uneven heating, with some parts of the pizza becoming too crispy and others remaining cold.
Re-frying: Re-frying pizza in a pan with oil is likely to make it excessively greasy and lose its original flavor.
Using a clothes iron: Some people have tried to use clothes irons to reheat pizza, but this method is highly unhygienic and may cause the pizza to stick to the iron's surface.
Remember, if you want to enjoy your leftover pizza, it's best to use an appropriate method like using an oven, toaster oven, or a skillet on low heat to ensure the pizza is heated evenly and retains its deliciousness. Alternatively, you can also enjoy cold pizza, as some people prefer it that way!