Jerel Heywood was visiting Rodney Copeland's home on Sunday in Lawton, Oklahoma when the attack occurred.
The snake was wrapped around a porch light, Copeland said.
As Heywood opens the screen door, the snake pops into the corner of the camera and bites into Heywood's head before retreating.
Heywood's first thought? "I got bit by a snake. Didn't know what kind it was," he said. "Have to get to the hospital."
Fortunately for him, the snake was not venomous.