I've been having problems with fruit flies in the kitchen because I'm bad about taking out the trash bag when it's got bad stuff in it. I was going to buy a fly trap with sticky tape, but found a natural remedy online instead. Pour some honey and apple cider vinegar in a jar and let the bastards fly in, then cap it and watch them drown in the sweet and sour pool of death. Once they get coated with the goo, there's no way for them to escape!