“Most people don’t believe me when I tell them what happened,” said Jon Maccoll who was attacked by an escaped buffalo near Ashover.
But Mr Maccoll, 44, of Danesmoor, faced the dramatic sight early in the morning as he drove across Stanage.
The security manager slammed on his brakes as five buffalo charged in to the road after escaping from a specialist meat farm - but one of the animals ran towards him and locked its horns in his car.
“You don’t expected to be going down a hill and five buffalo to run out, unless you’re in the Wild West maybe,” he said.
He added: “The road has a 60 mph speed limit and I was probably doing 55 mph. I put my brakes on as quickly as possible but one was trailing at the back and put its head down and charged at the car.”
Mr Maccoll swerved but the buffalo’s caught its horn in the car’s headlight and ripped it out.
Mr Maccoll’s Fiesta was damaged in the collision and his finger and knee hit the dashboard. He also torn a tendon in his neck.
But he said his injuries, which saw him take a week off work and have physiotherapy, were nothing compare to the psychological impact.
He added: “With it being an animal it really upset me. If I’d run a rabbit over I’d feel guilty for weeks but this really, really upset me.”
“The buffalo was screaming and there wasn’t anything I could do to help it.”
The harrowing experience led to the badly injured animal being shot by police.
Mr Maccoll said he had flashbacks and nightmares after the incident and was diagnosed with post traumatic stress disorder and only now - over a year on from the accident, which happened in September 2011 - is he getting better.
He made a claim against the beast’s owner, under the Animals Act 1971, and Chesterfield solicitors Graysons WE, has secured him a settlement.