I am proposing the idiomatic use of this expression. 'Ezber bozucu' (or 'bozan') can mean a person, event, argument or statement that takes a person beyond his/her habitual way of thinking and/or acting in this idiomatic context. I guess that is what Dr. Berne meant in the source material.

'Ezber bozucu (bozan)' mecazi olarak kullanageldigimiz bir ifade. Kaynak metindeki ifadeyle ortusuyor bence.