I was all set to write an amusing account of my day at the lake with friends last Saturday, and then I saw that Joolie beat me to it. Read it, it's funny. If I was talented, or even had the program, I would have photoshopped a picture of Joolie with fins and gills cause she was totally amphibious, if by amphibious you mean "able to get up on skis and wakeboard immediately despite not having practiced in many years."
My two best wipeouts of the day were off the tubes, no surprise if you read Joolie's account. One crash had me barrel-rolling off the side of the tube for two full revolutions. On the second, I ended up skidding backwards on my back so forcefully that I created my own wake at least a foot high and my swimtrunks were yanked below my ass.
Next time we go out, I'm going to record video of the tube wipeouts.