Press [Shift] + V followed by X during the sea
fights in chapter three to
advance to chapter 4.
View ending sequence:
Press [Shift] + W.
The Curse of Monkey Island integrates itself with the
Windows clock. On Plunder Island, the clock in Puerto
Pullo chimes accurately on every hour and half hour.
In addition, having Guybrush look at the clock gives
you an accurate (and humorous) time of day, to the second.