If you are visiting Chiang Mai or any Northern Thailand areas such as Chiang Raj, Chiang Dao or Mae Hong son, you must check out these people.  The are called the Long neck Karens and they are part a large amout of Hill Tribe people you find in the area. 

You can buy some fine crafts they produce as a way of helping out these friendly but unique people. 

Tourists think they are unique, but they actually think the tourists are unique.  How interesting!