A dangerous new drug is on the streets — it is called flakka or gravel or “$5 insanity.” And there’s a reason it has that last nickname. The drug spikes a user’s body temperature to dangerous levels, gives them paranoid hallucinations and makes them incredibly strong. In one case, a man in Florida ran naked down the street and then tried to have sex with a tree before being arrested. He told cops he was Thor — yes, the mythical god of thunder.