What are you thinking about?

One's remote memory / The supposed location of low-importance plans

(idiomatic) To guess or deduce what someone is thinking.

A stereotypical fictional character whose focus on academic matters leads them to ignore or forget their surroundings. / (by extension) A person who tends to be oblivious to reality.

plural of absent-minded professor

Alternative form of know one's own mind

(idiomatic) To convince someone to make a decision differing from what a previous one.

Used to politely ask someone for a favour. / A rhetorical question used to inform someone that they are being intrusive or annoying.

Alternative form of mind one's own business

simple past tense and past participle of lose one's mind