(idiom) first impressions carry the most weight; to be influenced by preconceived notions so that it is difficult to accept new ideas or opinions

Literally "the guest acts as host"; used to describe turning from a passive position to an active one, or taking the initiative away from someone else.

theory in psychology that focuses on observable behaviors rather than internal thoughts or feelings

To reverse the positions of host and guest; to override someone's privileges or rights as host.