6. John Kasay (2004)
For several minutes, Kasay was a Carolina hero. The Panthers made their first Super Bowl appearance against the Patriots. This went down as one of the most dramatic games ever. However, it’s a painful memory for Kasay. After an intense and even contest, Kasay kicked the teams level with a minute left. But he didn’t have much time to enjoy the adulation (via 247 Sports).
Next, Kasay had kickoff duties to attend to. But then the nightmare struck. He sent the ball out of bounds. This incurred an illegal procedure penalty. The scheming Patriots were able to bring the ball back downfield. Finally, Adam Vinatieri scored the winning field goal. It was a horrible moment for Kasay’s legacy because his mistake killed their dreams.