Adjustment of Status - I-485

Had interview in Boston MA, scheduled for 8:30AM. Arrived at 8:15 and was called in exactly at 8:30, i am the beneficiary and my wife the petitioner. When my name was called officer told me to go in alone and for my wife to wait outside we thought we were going to be separated for the questions. To my surprise as soon as i walked in was sworn in and as soon as i sat down officer said literally ‘i have no doubt about the validity of your marriage i will approve your application today’ i was extremely happy. He went over a couple of yes/no questions, had me sign a paper and that was it. I asked if my wife had to come in and he said ‘no you are all set congratulations’ interview took maybe 5 minutes. I think this rarely happens I guess officer was having a good day.