Weirdest folks on Earth!
If you want to get into trouble, try to visit North Sentinel Island, located between Thailand and India. Firstly, 250 people who live there attack anyone who approaches the shore. They have arrows! Secondly, they do not accept all gifts. For example, coconuts were accepted and eaten, while pigs were shot and buried. A red bucket is the most popular gift, while similar green buckets were untouched. All attempts to establish contact with these guys failed.