5. Jack Tatum paralyzes Darryl Stingley.
The NFL preseason is a joke. However, Jack Tatum took it seriously. So seriously, in fact, that when Patriots receiver Darryl Stingley grabbed a slant across the middle Tatum went for the big hit to try to send him a message. Unfortunately, Stingley also lowered his head and inadvertently allowed for the bruising Tatum to damage Stingley's spinal cord, paralyzing him from the chest down. Tatum did himself no favors by refusing to apologize to Stingley at any point between the hit in 1978 and Stingley's death in 2007.