Few days back I and some friends were sitting and chatting, one of my friends told us a unique thing that Devil gets hurt a lot when we say Salaam to others, I have a friend who say salaam to everyone without any discrimination. He said, Once I was going to offer Namaz I saw an old man who was walking with stick I said As Salaam O Alikum to him, he got angry and insulted me that why you say salaam to everyone stop doing it. I got really sad that an old man got angry on me. Now I will not say salaam to anyone but suddenly thought came to mind that a Muslim would never stop someone from salaam, immediately I read la hawla wala quwwata illa billah  لَاحَوْلَ وَلَا قُوَّۃَ اِلَّا بِاللّٰہ & that old man got disappeared. Then I understood that he was Devil and he came to stop me from this act.