Microwaves have a nasty habit of making food boiling hot in some places and ice cold in others. The next time you microwave something, poke a decent-sized hole in the middle of it, like a doughnut. The hole in the middle allows the food to heat more evenly, without your having to stop and stir it every 15 seconds.
Bonus tip: Before you freeze leftovers, poke the hole in the middle. This guarantees a quicker and more even defrosting process when you need to reheat them later.