Driver Attempts ‘Human Tie-Down’ Method on Highway, Waves Cheerfully as Mattress Nearly Takes Flight” Commuters on a rural stretch of highway were stunned this week after spotting a man stretched out across the roof of a moving sedan—using nothing but his own body weight to keep a full-size mattress from flying away. Cellphone video shows the man grinning, wind blasting his hair straight back, while giving a confident thumbs-up to passing drivers as he lies flat atop the mattress. Below him, the