Perfect Chemistry

based on chance or impulse (rather than upon reasoning, consistent rules, or a proper sense of fairness)

a personal preference — especially a prejudice that prevents objective consideration

or:

any tendency to move in a particular direction — such as a car that tends to want to swerve toward the right

deceive (convince to have a false belief)

to disagree; or disagreement or conflict — typically between people who cooperate, and often with official or majority beliefs

to a human:  to provoke or encourage someone to do something — usually something bad and often provoking in an annoying manner

to an animal:  to prod with a pointed stick to make it move

persistently annoy

or:

repeatedly attack to weaken or hinder

certain to happen (even if one tried to prevent it)

of a quality:  present at birth; or arising from within rather than having been learned or acquired

to quickly insert a comment that interrupts what another is saying

or more rarely and more generally:  to insert — as in "She interjects religion into politics," or "She interjects herself into my business."

make fearful of inadequacy

or:

threaten

to give in return — such as invitations, gifts, actions, or feelings

careful examination of something

to persuade someone to do something by tempting them with something pleasurable or desired — often to make them want to have sex

nervous about (or distrustful of) someone or something

extreme anger or angry punishment