Whoa! Someone messed up the hypnosis entry on wikipedia! A bunch of gibberish the likes which wore me out before I got to the meat. I'll let you decide for yourself if hypnosis is effective or even possible, I'm just interested in the goofy graphics. Even as a kid in high-school, when some hack was hired to come entertain an assembly, I wondered why he wasn't getting someone to rob a bank or boff him instead of making the student president bark like a dog. On the other hand, there were many times a women whispering in my ear made me do some stupid things over the years.
I took these from rags where getting someone to "do your bidding" probably mattered much, so the ads were likely a successful come-on. Yet you don't see many of the hypno-coins, books or pamphlets they were selling. Which means they worked so well the owners have kept them to give their children awesome power...or they sucked and were tossed in the trash.
