It's gross to eat food that has gone rotten.
Dan doesn't feel like cooking after work on Thursday and only has old leftovers in his fridge that smell weird.
Dan wants to find something to eat for dinner.
Dan gets rid of his old leftovers and orders some Chinese food for delivery.
Dan decides to heat up some old leftover pasta from a couple weeks ago and assumes the microwave will kill any germs.
Dan has a delicious meal and has some leftover that he puts in the fridge for later.
Dan gets sick after eating the pasta because there was too much bacteria for the microwave to kill.