GRAPHIC CONTENT. This terrifying video shows the effect of just one drop of snake venom on blood - turning it solid within moments. The clip shows a handler pinning down a dangerous Russell's viper, using a wooden stick on the back of its head. The handler then encourages the viper to bite into the the lid of a vial, causing venom to drain from its fangs and collect in the glass container. A single drop of the powerful poison is then syringed into a glass of blood. Almost instantly, the blood turns lumpy - sliding around the dish like jelly....