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.
From licking toads to pouring vodka into the eyes (don’t try these at home), folks have invented some crazy ways to catch a buzz, but one way just might be the sweetest (but still stupid). It’s called “mad honey” and even though most people have probably never heard of it, this honey with hallucinogenic properties has been around since ancient times.
http://research.tamu.edu/2014/11/03/how-eating-mad-honey-cost-pompey-the-great-1000-soldiers/