People tend to assimilate toward each other. Importantly, assimilations occur both explicitly and implicitly at various levels, ranging from low-level sensory-motor coordination to high-level conceptual mimicry. Teaching is often confused with simply one means of enhancing learning. However, as we shall see in the other articles in this issue, teaching is a dynamic phenomenon where interpersonal interactions occur explicitly and implicitly at multiple levels. Bonding through coordinated interpersonal interactions occupies a substantial portion of teaching. In this article, I would like to introduce two interpersonal phenomena that exemplify implicit interactions and discuss their relations to the new realization of teaching.