Caught on video. https://m.facebook.com/story.php?story_fbid=1105999412785742&id=52180763...
https://www.dropbox.com/s/ke8kxzuvgpdi0sn/Iceboat.mp4?dl=0
Little longer version
https://www.dropbox.com/s/ke8kxzuvgpdi0sn/Iceboat.mp4?dl=0