A brilliant scientist offers to graft a pair of wings seamlessly onto your back. The wingspan would be roughly proportional to your height and weight, however the musculature would be different (stronger) than a typical bird's meaning that they wouldn't have to be quite as large as one would expect in order to lift our poor human bodies, which are quite unsuited to flight. They would fold up neatly, but could not easily be hidden without a large, bulky sweater and a backpack (or something). You would still get cold/tired/hungry etc, though flight would help you burn calories incredibly quickly, making this a great workout. You'd obviously have to adjust your clothing to accommodate them, and it's possible that other brilliant scientists might try to hunt you down and study you. That being said, you'd be able to freaking fly from place to place. In this little hypothetical, would you be interested in having wings? If so (or if not), would you change your mind if the doctor offered other surgeries, such as hollowing out your bones or increasing your lung capacity? This is all completely safe, there will be no risk of complication aside from the anesthetic and recovery time will be fairly minimal. It'll take a while before you really learn how to use your wings, but once you do, the sky's the limit (I made a flying joke, guys!).