A scientist, along with his trusty guide, arrives in Borneo to research the giant rat of Sumatra. At dusk the first day, he's sitting by the campfire when in the distance, he hears tribal drums. They get louder. The guide remarks, "I don't like the sound of those drums..."
As dusk turns to evening, the drums get louder. The guide declares, "I really don't like the sound of those drums!"
Evening turns to dead of night. The drums get louder and louder, until it is obvious that the drummers must be quite close. The guide says again, "I really don't like the sound of those drums!"
Suddenly the drums stop, and a voice from the darkness cries out, "Hey man, he's not our regular drummer!"