for me it was The Ghost of Jupiter planetary nebula. It was recommended by Suzy to check out and i was not disappointed. Even though i viewed it in moderate light polluted skies, moderate seeing through an 8'' Newtonian at moderately low power, i was still amazed in that knowing what it was i was looking at. Having to star hop my way to it via skysafari on the Ipad to track it down made the thrill of the chase even better. Can't wait to try and view it again soon under really dark skies