I have made popcorn with bacon grease. It is great. You can't use all bacon grease it burns to easy mix half with oil of choice.
I will admit I popped up a batch of this last night. I may have used more oil than normal (I put too much bacon fat in and a quick dab of veggie oil) and popped it up. It ended up a little greasy but amazing. I know how I am making popcorn from here on out.