Instructing a couple of years ago a low hour PPL at an airfield with great approaches and a nice long runway, I had him give me his take-off safety brief. Halfway through he started going into "and if the engine stops I'll attempt to turn back".
I stopped him and quizzed him. No, he had never practiced a turnback, no he had never been formally taught to do a turnback.
He was sadly vague about where he'd got these ideas from - but I certainly went to some lengths to explain why flying a turnback was a really stupid idea for any pilot who was not trained and rehearsed in them.
G