I've gotten Ground Beef from the grocery store that the date is good, looks good, is a nice, natural pink. Get it home, open it up, it's brown inside, and smells rotted, like the butcher there put fresh meat on top of rotten stuff just to sell it.
I've also heard that some butchers/grocers will inject their meats with pink dye to make it look better and sell it more easily.
Can you say EWWW!?