<p>People leaving unnecessary lights on in your home can be extremely annoying, not to mention costly! This habit is a pet hate of Will Reid’s. In this video, the <a class="link" rel="nofollow" target="_blank" href="https://www.youtube.com/user/ivpresident68/videos" target="_blank">latest in a popular series,</a> he shows his teenage kids how to switch off the lights. Credit: YouTube/Will Reid</p>