Pitt bulls are like women.  They always seem sweet until they turn on you, rip your throat out, and take all your money.

The reputation isn't undeserved.  Look up the statistics.  Not all of them do, but do you really want to take the chance that they turn on a member of your family, or a neighbor's kid?  A little over 20 years ago, my daughter's best friend was at our house celebrating her 5th or 6th birthday with her.  Two days later, as her mother watched her on the backyard swing through the kitchen window, the neighbor's dog jumped the fence, grabbed that girl by the back of the neck, snapped it, and killed her instantly.  That was a Rottweiler, #2 on the list of most dangerous dogs, right behind pit bulls.