A recent complaint letter to P&G:
I found a pringle in a packet of your Prawn Cocktail flavour Pringles which appears to have extra material attached to it, from a packet which I purcahsed 2 days ago from my local Premiere on Wokingham Road, Reading. On the upper side is a large brown patch which looks a bit like chocolate and on the underside is a small patch with pimples and and a brown/blacky substance. I know that you carry out quality control very well but obviously this pringle seems to have escaped and I am not sure if it would be safe to consume. I have taken a couple of pictures and uploaded them [here].
I would be more than happy to post this to you for analysis or any other questions you would like to ask. I would like to query how this could have happened and would like to highlight that this pringle especially could be quite dangerous, especially to children, if consumed.