Does this work? I'm not too sure.
FX: TANNOY BONG
Announcer: If you happen to come across any suspicious packages while travelling with us, please stay calm and alert a member of our security staff at once. If however you are unable to alert any of our security staff (BEAT) Run! Scream! Panic! It could be a bomb for heavens sake! Take no chances my friend, take no chances!(BEAT) Thank you for listening and enjoy your journey.