Teak surfing is the practice of dragging (body surfing) a person from the swim platform while operating the boat. The ‘surfer’ is in danger from contact with the propeller and is in the exhaust outlet stream (CO poisoning). The USCG issued a safety alert:  http://www.uscgboating.org/articles/boatingview.aspx?id=22 and the State of Pennsylvania has passed legislation, the State of Nevada by regulation,  making the practice illegal. Watch for other states to follow suit.