Bill is a mean kitty because she was thrown out of a moving car onto the interstate when she was a kitten. We were kindhearted and rescued her. She's named Bill because she looked like Bill the Cat when we found her, cowering on the berm of I-70. 

We found out later, she's a girl, and she has an attitude. I tried to calm her down one day when someone brought a dog in the house. Bad move.  She bit me almost through the finger and gave me Cat Scratch Fever for which I had to take antibiotics for two weeks! Bill also enjoys tormenting our three other cats, Forrest, Spot, and Isabel, presumably because they have gender-appropriate names while Bill does not. Helpful hint: it's usually better to let the vet clinic determine the gender of a kitten before you name it.