You can't accurately predict how you'll act once you're angry, hungry or aroused

Psychologist George Loewenstein described the 'hot-cold empathy gap': in a calm, 'cold' state, people consistently underestimate how much a 'hot' emotional or physical state — anger, hunger, pain, desire — will change their own judgement and choices. The gap runs both ways: mid-craving, it's just as hard to remember what calm restraint felt like. It helps explain why good intentions set in advance so often collapse in the moment.

— George Loewenstein, Hot-Cold Empathy Gaps and Medical Decision Making — Health Psychology, 2005