static BufferedImage singleImagePreferablyFromLastWebcam() {
  L<Webcam> cams = Webcam.getWebcams();
  for (Webcam cam : reversedList(cams))
    try {
      ret singleImageFromWebcam(last(cams), true);
    } catch e {
      printShortException(e);
    }
  }
  null;
}