A researcher arrives in Borneo to gather data for his thesis. Accompanied by his trusty guide, he seeks out a very remote locale for researching the behavior of the giant rat of Sumatra.
Around dusk of the first day, he's sitting by the campfire with his guide when in the distance, he hears tribal drums. They get louder. The guide announces, "I don't like the sound of those drums."
Dusk turns to evening. The drums get louder. The guide says, "I really don't like the sound of those drums."