A fully alert, oriented patient with a lifelong odd, exaggerated way of shaking hands, an idiosyncratic quirk his colleagues have always found amusing, is otherwise entirely well and shows no confusion or disorientation of any kind. Before revealing the answer: is this occupational delirium?
No, this is more consistent with a mannerism than with occupational delirium. Occupational delirium occurs specifically within an acute, organically driven disturbance of consciousness; here, the patient is fully alert and oriented with no confusion at all, and the odd handshake is a longstanding personal quirk, which is the defining pattern of a mannerism rather than a sign of delirium.
References
- Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 9, 'Disorders of Consciousness'.