Where's The Quality Control?

Usually I will not make a big fuss over small matter but since McDonald had it pasted on their bulletin board about having good quality control, I can't help it but complaint to the manager 'bout this rotten piece of fry.

Can't really blame them coz' I think the staff was too tired and didn't bother or didn't even see this rotten piece mixed with the good ones. It's always like that, huh? Out of everything good, one rotten, you get complains....