I made the mistake of leaving my trash out when I went away for Memorial Day weekend and came home to find that a family of gnats had moved into my kitchen. Needless to say, I was not pleased. But thanks to a little trick of mine I was able to take the life of every last one of 'em by the following morning.
Simply take a plastic water bottle and cut off the top third or so of the bottle — just below the label will do. Then, pour a little wine (white or red) into the base. Next, invert the top portion of the bottle, cap off, into the bottle's base. The little insects will be attracted to the sweet wine, fly in, and be unable to escape. Jesus was onto something with his water and wine, I guess . . .