From the The Encyclopedia of Psychoactive Substances.

A drink, called Umm Nyolokh, made from the liver and bone marrow of a giraffe, is said by the Humr people of the Sudan to induce hallucinations and vivid dreams. Richard Rudgely speculates that the bone marrow may harbor DMT. The primary effect of Umm Nyolokh is the hallucinations it reportedly causes, which stupendously are hallucinations of giraffes. As whimsical as this sounds, seeing the animal that you just killed to get high sounds like it could make for some pretty terrifying trips.