Had a guy who we hired who showed a lot of potential. He was a little arrogant and had a good sized ego, but wasn't that much of a problem. He was very good at sales and eventually it went to his head: he started showing up late all the time, leaving early, cutting corners where he could.
The final straw came when he showed up late and someone spoke up about it to him. He decided the best choice of words he could yell were" "I MAKE THE MOST SALES AND I HAVE THE BIGGEST [BLEEP] SO YOU CAN ALL [BLEEP] OFF!"
He was fired on the spot. The customers thought it was pretty funny though.