The short answer to this question is yes. If you throw cooked spaghetti at a wall, it will stick. However, despite it being the most commonly cited way to test how done your spaghetti is, it isn’t the best way. Here’s why. Raw spaghetti will never stick to a wall; that much is certain. However, as you cook spaghetti, the outside is cooked much quicker than the inside is. With this knowledge, it is easy to assume that you could throw undercooked pasta that is still crunchy in the middle at the wall, and it will stick. You could throw mushy overcooked pasta at the wall, and it will stick. And yes, you can throw perfectly al dente pasta at the wall, and it will stick. While this is the method you’ll likely hear about the most often, it is far from accurate. If this is the method you use to test your pasta, it will be sheer luck if it is correctly done.