I'm more interested in the poll, not so much the discussion. So if you have nothing to say, please take 5 seconds and complete the poll!
It is interesting that perfluoroalkanes are completely inert and actually used for medical applications (such as pumping into burn victims lungs to facilitate respiration in damaged lungs). However, perfluoro carboxylic acids are not so benign, apparently. However we often eat them in popcorn, pizza, and once at fast food locations as food/beverage container coatings contain(ed) them.