I've never actually heaved my ring up whilst airborne, but have come close a few times...
When I fly with a mate of mine in his(or rather his clubs) Falke motorglider, we both take it in turns to soar-15 mins max each before we have to swap. If you're 'pilot handling' you can crank it round on a wingtip for hours, but take your hand off the stick, and within 10 mins you're feeling distinctly rough.
Mate of mine filled 3 bags whilst a space cadet in a VC10 on circuits and bumps. Everyone else was fine
Got VERY close whilst riding in the back seat of a MDM Fox with the German aerobatic teams coach. The Fox is a glider that's designed to go down! 2 sets of straps, as tight as possible plus a bit!
An amazing flight. But apart from the tow to 1000m, I think we were actually upright for about 30 seconds, and that was the round-out
We 'only' had +6 and -2 on the G-meter but that was enough for me! Strangely, the inverted turns were the worst- Imagine a 40° banked turn, but with your head on upside down on the outside of the turn
As to boats, well I've only fed the fishes once in the Red Sea, but in my defence, I'd been ill from both ends for the previous 2 days! It's actiually quite spectacular there, cos you can
see the big fishies eating your breakfast
I did dive afterwards, but spent my dive throwing up underwater...yes, it CAN be done, but only with liquid contents else it blocks your valve
Had someone throw up out of a balloon a couple of years ago. They'd had a bad case of Montezumas revenge(we discovered later!) and shouldn't have flown really. Anyway, she let it be known that she wasn't in the best of health, and promptly loosed her lunch(it was a pm flight) out over the side at 4000' - Its quite interesting at that height, cos it spreads out in a multi-coloured fan pattern...wish I'd had a camera
Still, at least she had the courtesy to do it over the side, unlike the passenger in our Chief Pilots' basket last year, who lasted until about 45 seconds before the landing before projectile vomiting over her sister, and losing it from the other end at the same time....Several other pax were close to losing it after that display, and the CP was retching too!...We threw away the floor padding, but the poor Crew Chief had a lovely job scrubbing the sidewall cushions....