Whatever this guy is on, it's not good. He looks and behave exactly like a movie zombie trying to get to people inside a bus by ramming the bus's window with his head.
Here's a Forbes article about the stuff the man is allegedly on, Cloud 9:
“Cloud 9 is not a drug,” says Rusty Payne, a spokesman for the Drug Enforcement Administration (DEA). “It’s a name.” Some accounts describe Cloud 9 as a marijuana substitute, similar to products such as Spice or K2. Other accounts, including 2013 testimony by Joseph Rannazzisi, who runs the DEA’s Office of Diversion Control, identify Cloud 9 as a methamphetamine or cocaine substitute in the same family as products sold as “bath salts.” So which is it? A synthetic cannabinoid or a synthetic stimulant? “It could be anything,” Payne says. “It could be all of those things.” As John Yang noted in his NBC report, the bottles of Cloud 9 sold in southeastern Michigan have “just the name on the label, no other writing. It doesn’t say who made it, where it’s from, or what’s in it.”
Stories in the local press do not shed much light on that last question. In a May 21 story headlined “Cloud 9 Rains Misery on Family,” Lisa Roose-Church, a reporter for Michigan’s Livingston County Press, calls Cloud 9 “a synthetic cannabinoid” marketed as “hookah-related incense or oil.” But she also says “it has been sold as bath salts” and quotes the website of Sober Living by the Sea, a chain of California drug treatment centers, as saying Cloud 9 “gives users a euphoric ecstasy-like sensation, with an amphetamine-like high.” Roose-Church adds that “product ingredients vary, but typically include stimulant compounds such as methylenedioxypyrovalerone (MDPV) or 4-methylmethcathinone, also known as mephedrone.” Those are both stimulants, not cannabinoids, and they are banned by name under federal law, which makes NBC’s claim that Cloud 9 is legal rather puzzling. A September 18 story from Associated Newspapers of Michigan, headlined “3 Teens Suffer Effects of ‘Bath Salts’ Overdose,” likewise describes Cloud 9 as “a synthetic cathinone,” the family to which MDPV and mephedrone belong.