(spoiler) Wing-Walking versus Bungee Jumping?
I just finished Season 2 and can't believe he did the wing-walking on the plane, but wouldn't do the bungee-jumping at all (in New Zealand or Africa). The wing-walking seems far more frightening and dangerous ie climbing out of the cockpit of the bi-plane into the harness on the wing; then doing a "loop-de-loop"! Kudos to Karl for doing that --- surely that's braver than anything Ricky or Stephen would do!