Honey produced from some species of the Rhododendron can create a euphoric, even hallucinogenic experience when eaten. The plants produce grayanotoxins, which the bees inadvertently incorporate into their honey. Whilst many honeys produced from the Ericaceae family (Rhododendrons and heathers) may contain the toxin in tiny amounts, it is purposely produced in eastern Turkey to create a "mad honey". This honey sells for (if my calculations are correct!) £227 per kg! However, if you are contemplating mad honey as a new morning pick-up on your porridge you should probably be aware of what happens from over-consumption. Mad honey causes vomiting, diarrhea, loss of consciousness, seizures and although rare, death.