Make some "to do" about lighting a large candle at the pack meeting. It burns all the way through your meeting. When it's time to close, have boys imitating a fire brigade come running in and circle the room toward the candle. One or two boys make siren noises, another one or two might have bells ringing, several could have a hose, one carries a bucket. They all rush toward the candle and just before they get there, the Cubmaster blows out the candle. The firemen look disgusted and walk away muttering.
The Cubmaster then says, "Good night all".