YouTube shows thousands of stunts. Numerous are jumps and falls from, over or on just about anything and anywhere, with or without safety device, triumphant or painfully smashing on vulnerable body parts. Risks are just as real in para-sailing or on the ground, as with urban 'parkour' acrobatics or skateboarding, or even driving cars on an Indian circus ramp devised for motorbikes.—KGF Vissers