Is that blood?

We had blamed the fifth graders for making the blue snow that the third graders had eaten on Tuesday.  We discovered today that our assumptions were quite wrong.  We found out that our third graders were bringing food from the lunchroom and stashing in the snow fort farthest from the school doors.  Karen found it.  I got the grape juice.  I had to look twice.  At first I thought I had found a "bloody mess", until I listened to the playground chatter.  It had been "strategically placed" to trick us!