Never leave a tape unattended in
your VCR. To understand this theory, you have to remember that
videotapes work like rubberbands. If you let the tape stretch
out long enough, the tape will remain stretched out. (When you
leave the tape in the VCR, the drums and heads of the VCR stretches
the tape) A vertical line will appear and will possibly ruin your
image in that portion of the video.