Self-Defense - MMA - Double Leg Takedown
Human Weapon video tutorial: The double leg takedown (colloquially simply known as a double leg or even double) involves grabbing the opponent with both arms around the opponent's legs while keeping the chest close to the opponent, and using this position to force the opponent to the ground.

Self-Defense - MMA - Triangle Choke
Human Weapon: This video tutorial teaches you the triangle choke technique.

Self-Defense - Silat - Sinking Python
Human Weapon: this video tutorial demonstrates the Sinking Python trick.