YouTube used to select the preview image by taking a freeze frame at a certain point in the video. Older YouTubers used to manipulate this by putting the sugge

YouTube used to select the preview image by taking a freeze frame at a certain point in the video. Older YouTubers used to manipulate this by putting the suggestive part of the video at the right time. Here's a blast from the past doing just that: https://www.youtube.com/watch?v=r8tXjJL3xcM https://www.youtube.com/watch?v=r8tXjJL3xcM