For my 50th, I went on the so-called Vomet Comet aircraft to experience zero gravity. It was an amazing experience! After being eased in with Mars and Moon level gravity, we got about a dozen 30-second bursts in true zero G. Although in this state you have no sense of up or down, I found it very counterintuitive to deliberately turn myself upside down. However, with all the other bodies floating around me, that kinda happened by accident as you can see in this video.