Deck Landings - 3 polished tables end to end and lubricated with beer. Take shirt off and run at the tables. At a pre-determined range, launch body thru air and land chest first, arms out, legs splayed etc, skid along tables and stop before the end. Believe me, it aint easy.
Best I ever saw (middle 80's) - junior mate on sqn got airborne too early and, landing short, smashed his top teeth on edge of table. He spat out 3 of them, returned to the run up area and executed a perfect deck landing. He was then driven to casualty with excessive blood loss - needed a transfusion. Got false plate for front teeth 3 months later. Awesome.