My kids at first were, typically, acting like they didn't have a clue how to be quiet and listen until I mentioned that THIS MAY BE REAL and then some of them bought a clue and got quiet. All in all they didn't do too bad, and my two really severe ping pong ADHD kids even managed not to lose it for the time we had to stay quiet.
That being said, I was way luckier than Mr. Math. Mr. Math had Happy Boy in the room.
Happy Boy did not deal with the lockdown well. If you recall, Happy Boy has one volume - LOUD - and the fact that it was a lockdown didn't help any.
"IS IT FOR REAL MR. MATH? IS IT FOR REAL? IS IT FOR REAL?" he kept asking Mr. Math. Like me, he suspected it might be real and was desperate to quiet Happy Boy down. Happy Boy wasn't having any of it.
"IS IT FOR REAL MR. MATH? IS IT? IS IT?" he kept yelling.
Mr. Math at this point is trying, desperately to get him quiet. "It might be, I don't know. But you HAVE TO BE QUIET because we don't want anyone to even think there is anyone in this room."
"BUT IS IT REAL? IS IT REAL?" Happy Boy wanted to know.
At this point I think Happy Boy's classmates were wondering about how much trouble they'd get into if they'd just opened the door and shoved him out in the hall (to be picked up by marauding bands of bank robbers, hostage takers and even some skitters.) Mr. Math was beginning to wonder about how much trouble he'd get into if he'd just clamped his hand over his mouth and got him to quiet down that way.
Finally one of the other kids put a stop to it, "Will you just shut the hell up and listen to Mr. Math?!" he yelled. The fact that this was a Normally Very Quiet Kid, shocked not only Mr. Math and the other kids, but actually managed to get Happy Boy's attention. Mr. Math was so shocked he didn't even write him up for using profanity. (He probably wanted to give him a medal.) Finally Happy Boy got the message and got quiet and was silent for the rest of the drill.
Which was what it really was, we finally found out.
But just you watch. We'll have another bank robbery in town next week and knowing my luck, Happy Boy will be in my room.