Friede has withstood snakebites and injections for nearly two decades and still has a refrigerator full of venom. In videos posted to his YouTube channel, he shows off swollen fang marks on his arms from black mamba, taipan and water cobra bites.

A man who injected himself with snake venom helped create an antivenom that can protect mice from poisonous snakes. Researchers hope for human clinical trials one day.