Self-Defense - Judo - Juji Gatame
Human Weapon: This video tutorial shows you how to do a Juji Gatame. The juji-gatame is derived from judo.(十字固, "cross armlock" or technically referred to as ude-hishigi-juji-gatame.

Self-Defense - Karate Punch Blocking "Uchi Uke"
Human Weapon: This video tutorial shows you how to do a Karate Style Punch Block, This Move is called the ' Uchi Uke ' (outside mid-level block)

Self-Defense - MMA - The Sprawl
Human Weapon: this video tutorial shows you how to do The Sprawl trick. It is defensive technique that is done in response to certain takedown attempts.