In Vino Veritas

In vino veritas is a Latin phrase that means 'in wine, there is truth', suggesting a person under the influence of alcohol is more likely to speak their hidden thoughts and desires. The phrase is sometimes continued as, in vīnō vēritās, in aquā sānitās, 'in wine there is truth, in water there is (good) health'. Similar phrases exist across cultures and languages. (Wikipedia)