Hamas media is implying that the group is ghoulishly holding on to some body parts of a soldier or two who were killed in Gaza - or even a live soldier that somehow no Israelis know about.
The most likely body that Hamas has would be of Staff Sergeant Oron Shaul, whose death was determined but whose body was never recovered.
Ismail Haniyeh, Hamas' "political bureau" vice president, has said that there will be a number of "surprises" in the next few days.