I had about 30sec of side by side sailing with a dolphin today, after which she decided to show me who is faster - much faster!
Then reviewing some of the videos my wife took from the shore, we found out she actually happened to capture us both in this video, right before that 'play racing' - about halfway thru the video, lower part of by the screen (not enough that she beat me, she is also in better focus in this video than me!).

Sorry - looks like I can't upload a..mov video and not seeing an option to delete the post.