There is a rope in the door frame of the 737 (over wing) and a yellow painted tie down on the wing surface - this is to aid evacuation from overwing exits .?
What's that all about ? Given the cabin crew are at the front and rear of the aircraft , ever seen one used ? It's such a secret , Pax would never know its there !!
IF the passengers found it and attached it to the wing - it would lead you to the middle of the wing - yep straight in the direction you don't want to be going .....