Every Tibetan Buddhist tradition contains practices of the chöd sadhana，a very special practice that can be separated into many types. The Words of My Perfect Teacher mentions a preliminary practice called the Kusali Chöd. In this practice, you imagine offering your body as a sacrifice to Kuntuzangpo and giving it to all types of spirits, and so forth. The real practice of chöd is to use the wisdom of realizing emptiness in a special technique to remove stubbornness and troubling thoughts. The premise of this practice is that you must realize emptiness and let this enlightenment experience strengthen. After a certain time, you can meditate in areas where ghosts are rumored to appear. During such times there are usually activities that gather spirits, and you might hear strange sounds or witness odd occurrences. This would make ordinary people very nervous and their self-attachment would be very obvious. At such times, if you can focus on emptiness, you will be able to remove your self-attachment successfully, and at the same time remove fear and other negative emotions.

~ Luminous Wisdom Book Series 10