In a small mixing bowl, add combine popcorn kernels, oil, and salt. Toss well until kernels are evenly coated in oil.
Transfer popcorn kernels to a clean brown paper lunch bag. Evenly fold top of bag over by approximately 1.5 inches and then fold each of the top corners of the bag over diagonally. Tear a small tab out of the center of each diagonal fold, and then fold that over as well. This prevents the bag from opening as the popcorn expands.
Place the kernel-filled brown paper bag in the microwave and run on high for about 2 minutes, watching carefully the entire time to ensure the bag doesn't smolder or, worse, catch fire. The exact timing will vary depending on the microwave, so be sure to err a little on the un-popped side of things to avoid scorching and burning the popcorn. Serve.
