How did he do it?

Some folks claimed he was a master at mass hypnosis. Others said he used some sort of nerve gas shit or some other drug that made people hallucinate, put ‘em on a bad trip. No one did figure out how he scared the shit outta' folks. Hell, the FBI even paid old Forrester a visit to tryin' find out how he pulled that shit off. Some other feds from some military or spy agency even talked to him... so the story goes.