I had that issue on facebook today with a cashier studying psychology trying to explain to me how the presence of a gun was the "stimulus" which caused the Fort Hood shooter to shoot people
She excused her from the discussion when I asked her how, if the gun was a stimulus, did whatever issue he had that made him crazy cause him to GET the gun, BRING IT to the post, etc.
"If the gun is the stimulus, then what was the stimulus that caused him to GET the "stimulus" and bring it to the post?"
"Well <insert some psychiatrist here" has a theory about *gobbledygook here* in which he states *gross misunderstanding of the topic*, so if you have a problem take it up with them"
then "you're arguing with people with PHDs all over the world"
I replied "No, i'm arguing with a cashier who is grossly misunderstanding the ideas of PHDs all over the world"
nothing further, then the topic was deleted.