I have problems with smells triggering very strong emotions, and I have no memories actually associated with the smell that would explain. So it's like an intrusive emotion rather than a thought.

In reference to intrusive thoughts, I also find myself calling myself certain things, and certain names with no specific memories of being called that. And it does seem completely familiar and "right." I can remember calling myself a ***** inside my head as early as kindergarten. Pretty sure the only way I would know to call myself that is if someone else called me that first, but I don't remember ever being called that at that age. Later, my mother called me that all the time.