Mentzer said in one of those videos that Arnold was doing lines of coke all day long. Arnold never struck me as the recreational drug user type. Certainly not someone feeding a habit to the point where he's doing lines during a contest. But being the social animal he was I can see him indulging at a Hollywood party.
Also ironic a meth addict calling him a coke head.
I can picture Mentzer hallucinating , having nightmares in deep meth-induced psychosis having a vision of Arnold back stage in Sydney , doing lines of cocaine with all the judges and Ben and Joe Weider, Paul Graham, Franco, Jusup, Waller,and Samir "Mike, if you want to get lean for a show you're supposed to use coc-CAINE not coca-COLA" then everyone bursting into laughter. A furious Mentzer pops another dexadrine and washes it down with a cup of his own urine.