Honestly, I don't know what happened to them. Tim said that if the middles were warm, the chocolate might bust open and goo would leak out, but they were fresh out of the freezer. (OK, we set one tray outside. It was 22 degrees!) They were nice and chilly before I dunked them and this has never happened before. Every single one either leaked out a little hole like this or got a huge crack. Very odd.
Today, Indigo (our archenemy) was smashed in the face by a cake ball. Delicious and effective.