Not sure where you're getting the idea anybody is jealous or angry. If anything, we're laughing about it.Stephen K. Hayes' Ninja Self Defense Steven Hayes teaching online All the best teacher’s from all major martial arts offer online and dvd instructions, including Hatsumi.,[is this a serious question] if jealousy makes you guys angry, you need to look deep inside yourself and what martial arts really means,and try hard to remember the self discipline and respect part of it.