Just don't panic when the cruise ship you're on signals that it is operating in reverse by sounding the horn three times.
There's a General Alarm signal (above), but no Abandon Ship signal. The captain gives those manually.
(I may be blatantly wrong!)
The General Alarm typically calls for the crew to proceed (at haste!) to the muster station to be informed of the nature of the emergency and be put to work handling the situation.
Luckily, I've only ever had to abandon ship during a couple of drills.