You'll all turn veggie after reading this (and I promise it's not an urban myth, my friend used to work in the gelatine plant when this happened and saw the reports for himself).
Basically loads of shipments of animal bones etc arrive every day, and every so often an inspection is carried out to ensure that no human remains make their way into your diet, and they do this by removing a sample from a few of the shipments. Human remains were found in two of the samples, but rather than testing all the other shipments and destroying those found to be contaminated, they simply destroyed the two that had human bits in them. God knows what was left in the rest!
Jelly anyone???