It sounded like an explosion in the school just now. I am guessing the kids just found out that school will be closed for the next 3 days due to the H1N1 flu (swine flue), which they call the new flu. I have a feeling that this will not be their last holiday because of this. We teachers, of course, must still come to school.
I would recommend against following this kids lead if you want to avoid the flu.