Psychology students hear about conditioning, attachment and the subconscious all day, so a well-aimed line lands quickly. Freud, Pavlov and cognitive-bias material dominates, and the lecture theatre or campus bar is the venue where it earns the most.
The meta move works too: analysing the line while delivering it — "you'll notice what I did there" — flatters exactly the kind of person this category targets.
Psychology lines have a structural advantage: their audience enjoys being read. A line about attachment styles or operant conditioning is really a claim that you noticed how their mind works, which is the most flattering thing an opener can imply. Campus is the home fixture, but therapy-literate crowds everywhere are fair game.
The neighbouring disciplines have their own material: biology for the wet sciences, physics for the department that measures everything, and the full nerd collection for interdisciplinary work.
