Redenbacher may be the most recognizable brand, but I highly encourage you to go find some popping corn from a farmer, from a Natural foods store, dry your own, trust me you will no longer need to drown it in butter. My own child won't have anything to do with bar coded popcorn because getting (fresh) is that much tastier and, wait for it, CHEAPER, significantly. Did I mention no junk added, no calories, or weird stuff that makes no sense why it has been added to popcorn. Popcorn is full of health benefits like fiber which makes it a great snack, it's when you (or the food industry) add that junk it turns from delicious and healthy to a high calorie junk food.
For fun you can get it still on the ears of corn and rub it with a bit of cooking oil, put it in a paper bag and microwave it for 45 seconds. The kids (and you) will giggle and ooh and aaah.
When that novelty where's off you can coat the bottom of a pot with cooking oil, add in popcorn kernels (no more than cover the bottom of the pot in a single layer), put on the stove over medium-high heat and cover. In a minute or two you will hear the familiar sound of pop, pop, popping. And when the popping decreases to a couple (yes 2-3 seconds) between pops remove from heat but remain covered for 30 more seconds. Pour into a bowl and there you go! Delicious treat without any guilt. Fiber it up. Add herbs to a kosher salt and sprinkle over, or a bit of fresh grated parm, or leave as is- it's that good! Also great as a garnish to fall soups.