When the fruits of the Suicide Tree (fig.), botanically known as Cerbera odollam, and its kernels called look tihn pet nahm in Thai, fall, their thin skin quickly decomposes, exposing the fibrous, woody tissue of the seed.

These kernels, called pong pong seeds (fig.), are initially white in colour but eventually turn blackish upon exposure to air. The fibrous shell is slightly larger than a tennis ball and, at first glance or from a distance, resembles a small coconut. These seeds are often used decoratively in dry flower arrangements (fig.).