Mission:Improbable

You step into the kindergarten classroom. The children are all busy fingerpainting.
"Can I help you, sir?" asks the teacher.
"Yes. I am looking for your cloakroom. I am here to fix the hooks."
"Ah ... I see. It's just around here, sir."
"Thank you."
In the cloakroom, you reach behind the various coats until you find the South Park lunchbox hidden in the back.
You open up the box to reveal the tape recorder hidden inside. You press play.
"Good morning. Your presence is required at headquarters as soon as possible. This tape will self destruct in ten seconds."
You close up the box and place it back behind the coats.
As you leave the room, you can see the smoke already coming from the cloakroom.
As you quickly leave the building, you can hear the screams and fire alarms, but you hurry on, not wishing to draw attention to yourself.