My first real lockdown

I am in at the high school for just an afternoon...just a half day...and we are on a lock down.  It's actually not been the worst scenario as I'm technically at lunch so I have no official responsibilities.  Three students (two of whom I know) were eating lunch in the classroom, so we are all stuck in here together.  Apparently there is a bomb threat on a note in a bathroom somewhere in the building.  While I've had some odd teaching experiences, this is my first real lock down...and it's an experience I could do without.