Don't Type! That which holds the image of a bug becomes itself a bug.
Today I learned a lesson on software defects while transcribing my handwritten lecture notes on, paradoxically, software defects in medical devices. I attempted to highlight recent examples of software defects. The lesson can be summed up with this screenshot.
Warning: reproduce at your own risk. My moleskin notebook also appears to have spontaneously combusted after writing the magic eight characters.