1. He ran away from home on a mad impulse.2. When I was fighting with my sister I had a mad impulse to smash things.
 on a mad impulse have a mad impulse to do something請參考例句.
1. 一氣之下離家出走.2. 當我跟妹妹吵架時我有摔東西的衝動.
It is indecnt of him to take money away from his divorced wife.