Significant Damage?

So - today is the day. This is the infamous Friday that the anonymous author of the 'bathroom' note mentioned. So - my daughter of course, wants to skip school today - not due to fear - but anything to get out of a class. My son - well, this is Senior night for his basketball team. He wouldn't miss school today even if it blew up! I imagine that today would be the safest day to be there - cops are everywhere. I worry more about Monday! I texted them both this morning - it merely said "just remember - dive under the desk..." I think I am a mean mom...