Nothing like it
It was my privilege lead a young prisoner into salvation yesterday. When he came forward for prayer he didn't know what to do but when I said that he could pray the prayer of committment standing up, sitting down or kneeling. He chose to kneel. So in the middle of chapel, we both knelt and it's not allowed but I put my arm round his shoulders and he sincerely asked the Lord into his life. We then stood to pray as he received the Holy Spirit.
All five in the group received prayer and another asked the Lord into his life for the first time.
I do a lot of things as a Salvation Army officer but there is nothing that can top leading someone to Christ. However many times you do it (and its not often enough) the joy is unbeatable.