From Longman Dictionary of Contemporary Englishmoment/fit of madnessmoment/fit of madnesswhen someone does something without thinking clearly In a moment of madness, I agreed to have the party at my house. → madness
Examples from the Corpus
moment/fit of madness• Grandcourt finds Gwendolen screaming in a fit of madness.• Francis made his will in a moment of madness.• In a moment of madness Rosenoir kicked Alan Kernaghan as he lay on the ground.• It was a moment of madness.• A brief moment of madness, I admit.• Just that one brief moment of madness ... Then the bitter tears of self-reproach.• Essex are likely to fine Neil Foster for his moments of madness yesterday.• He wondered if the bad blood of the d'Urbervilles was to blame for this moment of madness. 