Source: http://lifehacker.com/5519589/how-to-make-popcorn-with-bacon-fat
First of all, if you're still cooking your popcorn in the microwave, you really should learn how to make movie theater popcorn at home for pennies on the dollar—especially because you can't incorporate bacon in the microwave version. If you already have a popcorn popper (or know how to cook popcorn on the stove), then you pretty much know how to make it with bacon fat—all you need is some bacon fat. If you have some leftover from the last time you made bacon, that's perfect. If you don't have any, then why not fry some up right now? You only live once, after all. Once you have the fat, just use about 3 tablespoons of it in place of your usual popcorn oil.
"But Lifehacker," I can already hear some of you say, "bacon-flavored popcorn sounds incredibly disgusting." Luckily, the popcorn doesn't actually taste like bacon—if you wanted that, you could just make some bacon—instead, it gives a nice smoky flavor to the popcorn that you don't usually get, which is nice since popcorn can sometimes taste a little bland. Hit the link for the detailed popping instructions, if you aren't already a stovetop popcorn master. Got any other favorite meals or snacks made better by bacon? Rattle them off in the comments!