Black lemurs get high off millipedes in Madagascar. The lemurs bite the millipedes gently to provoke the millipedes to spray out defensive chemicals including cyanide. The lemurs crave these chemicals and rub the secretions all over their body to act as an insect repellant but as a consequence the lemurs enter a blissful state.
Clip taken from the series Weird Nature. A John Downer Production for the BBC.