whats that alarm - fire alarm?

[William]

should we evacuate?

 

[William]

here comes the fire brigade, just pulled up out front

 

[William]

false alarm, fire brigade cleared the alarm.
cha-ching!

 

[Chen]

i heard to but what is cha ching ?

 

[William]

i heard to but what is cha ching ?

you didn't think the fire brigade was free did you?
for false alarms, they charge $500 for every 15 minutes not in the station