The Eleventh Doctor Who's episode "The Lodger" has the doctor passing as an ordinary human to gather information about the strange events in the second floor above the room he's renting. He's shown to be totally ignorant about human conventions, which is unbelievable given that he's spent nine hundred years around humans of all epochs, has a self-professed admiration for humanity, and has disguised as a human tens of times before. (The Tenth Doctor even transformed into a complete human in the "Family of Blood" episode, so he knows humanity first-hand). By the time "The Lodger" occurs, he seems to have forgotten all that.
The Eleventh Doctor Who's episode "The Lodger" has the doctor passing as an ordinary human to gather information about the strange events in the second floor above the room he's renting. He's shown to be totally ignorant about human conventions, which is unbelievable given that he's spent nine hundred years around humans of all epochs, has a self-professed admiration for humanity, and has disguised as a human tens of times before. (The Tenth Doctor even transformed into a complete human in the "Family of Blood" episode, so he knows humanity first-hand). By the time "The Lodger" occurs, he seems to have forgotten all that.