This Skit is meant for Cub Scouts.
Decide for yourself if it is appropriate for your younger scouts or not.

6 to 10 scouts

Make sure you practice so the Beeeeeps start and stop when they should and so that the punch line does not drag on too long.

All scouts but one stand in line. Lead scout is in front or to one side.
Leader: For the next ten seconds we wil conduct a test of the emergency broadcast system.
(line of scouts all make Beeeeeeeeeeep sound until the leader raises his hand.)
Leader: Thank you. This concludes the test of the emergency broadcast system. Had this been an actual emergency, you would have heard...
(line of scouts scream in panic and run around)