If you're in a hurry, or just really hungry, the microwave is the way to go. Simply poke some holes in your potato, toss it in the microwave for 3-4 minutes, and voila! You've got a cooked potato. But, be warned, it's not going to be the fluffiest potato in the world, but hey, it's better than nothing, right?
Now, I know what you're thinking, "What about all the moisture that gets trapped inside the potato?" Well, let me tell you, it's not the end of the world. Just take a fork and give it a little massage to loosen up the insides. And, if you're feeling extra fancy, you can even add some butter or cheese to make it a little more interesting.