I once read a quote from a patient who that said they kept giving her ECT (that’s seizure inducing electric shocks to the brain, widely used in the UK in-spite of people thinking it is some horrible relic of history that was banned along with public executions and badger-baiting). Every time after they had electro-shocked her brain they asked if she felt better. She kept on saying “No”, so they kept on giving her more ECT. Eventually she figured out if that if she said “Yes” they would stop giving her ECT, and it worked! This was of course recorded as a successful outcome and used to prove that ECT works