That's funny! (Not the thing the teachers did, I mean what Puck was talking about).
I actually went through something kinda like that when I was in school. There was a homicide that took place in my hometown, & once police came up with a suspect list, they went to my school, believing that they would be there. (Most of the suspects were teens).
Anyway, we had a lockdown. I was in the home ec room with 5 guys & about 25 girls (Note: I was not there for a class, this was during lunch). Every single girl was crying, & all of us guys were grabbing kitchen knifes, thinking that some student went berserk & was going on a rampage.
It was all kinda funny when we learned what was really going on.