There's a new pizza hack that will make sure your pie is delivered to your home hot and fresh like it just came out of the oven. If you know that your pizza order will spend a good amount of time in the delivery driver's car before it gets to your door, you should order it unsliced. Apparently, slicing the pizza causes it to lose heat faster and to become soggy because some of the oil and sauce seeps into the cuts. When it arrives, take out your pizza cutter and slice away.