No I'm Spartacus!

I was walking down the hall to my secret bathroom when I happened upon a group of my students. There were about 10 boys looking over the railing, so I looked over and noticed that there was a milk box on the floor. Obviously one of them through it off the second story and tried to get it into the trash can.
I asked them who through it and in a moment of heroism they each replied, "I threw it!"-"No I threw it!" I am guessing non of them saw Spartacus otherwise they would have known their fate.