It is unlikely that you could win this case. To win, you'd have to prove that it was unreasonably negligent for there to be a kernal in a bag of popcorn. But whether or not you have seen a kernal in a bag of this popcorn before, unpoppwed kernals are not unual or uncommon in popcorn; therefore, it is not likely to be found to be unreasonably careless for one to be included in this bag, since sometimes the corn does not 100% pop.