Use two brown bags and put one inside the other. Dump in 1/3 cup of popcorn kernels and 2 to 3 tablespoons of popping corn oil. Add salt to taste.
Fold the bag three or four times. Place in microwave with fold down.
If your microwave has a popcorn setting like ours does, just set it and wait. Otherwise, you'll have to do the same song and dance as regular microwave popcorn (set it for 5 minutes and wait until the popping sound slows).
If you like it buttery, spritz a little of this magic right into the bag.
The benefits: cheaper, healthier, no yucky microwave popcorn smell, and it's fun!