I made this discovery when I had a studio near a row of trash cans. Flies were constantly entering through the mail slot, causing serious damage to my attention span. I devised this method as a way to 86 them out of my space, as I regarded them to be "sentient beings." (They are truly formidable enemies, too.) Nickelodeon contracted this piece, and it later reappeared in their "best of" Ten Year Anniversary issue. In case you don't have a spare bike horn, you can use a plastic cup with an index card. Make sure you don't have any unframed watercolors on your walls, though.