Snake in Engine 5

A guy in St. Louis was driving to work on Hwy I-44 when he heard a 'pop.'
He thought it sounded like a flat tire, though his ride wasn't affected.
After pulling over, checking the tires and finding them intact he opened the
hood to look at the motor.
Before the hood was even all the way open he jumped back in shock and
knocked his head on the partially opened hood,
unable to believe what his eyes were seeing!
Nobody was going to believe this! You sure wouldn't have either!
Fortunately, a coworker with a camera recognized him along side the road and
stopped to see if he could help.