Which sport that you have never tried would offer the greatest potential for harm, to you & or others?

Yeah, let’s say you’re feeling brave or foolish as the case may be. You try a sporting pursuit which on the face of it seems a little rash, but hey, you only live once eh? Which sport would be more catastrophic in theory for either yourself or those unfortunate enough to be in your flight path? This may end in tears & tantrums but at least you tried damn it, at least you did that!!