Like DCnDC I once got seasick on a fishing boat off the coast of Atlantic City. Although I puked all over, I got over it once the boat owner (my uncle) allowed me to steer for a while (I was probably about 12 at the time also). Years later I was on a party boat with my father and brother and ended up eating three lunches (yum!). Never been motion-sick again.
I got it repetitively when I used to work with this 3D spinning chair. 
And occasionally on boats.
Oops, I meant this link.
I get motion sickness rather easily when I’m moving backwards or sideways.
So; I can’t sit in that reverse back seat of old station wagons; and I can’t ride in those tea cup rides at amusement parks. Roller coasters are OK though.
Yes, constantly. I can’t read in a car, so I wind up being the driver to damn near everywhere. That’s not so bad because I like to drive.
But I’ll get seasick looking at a picture of a boat. I can handle airplanes on a smooth ride, but if there is any turbulence, I’m hurling. And the goddamn shaky-cam that movies are made with these days (Saving Private Ryan for example) will send me straight out of the theater.
I’ve been on choppy waters very early in the morning with a hangover, and my stomach felt fine, yet I can’t read a book in a flippin’ car! <throws up hands in disgust>
I only get sick in the car if I’m reading and we’re in stop-and-go traffic. Long car rides are no problem but if I’m trying to read a map of downtown . . . ugh, I hope we get to dinner soon.
One time in my life I got motion sickness - I’d been on a boat for a week and been fine, but I drank waaaay too much wine that night and when I woke up that morning, oh god.
All forms of public transportation are problems for me: planes, trains, buses, cabs - I have to be medicated or hurlage will commence. I can barely watch amusement park rides, and can ride very few. Nothing spinning, no jerking motions, but I can do hills, though am too much of a chickenshit to enjoy roller coasters. I’ve actually felt a little queasy in elevators in the really tall buildings, if I have to go a ways (like 30+ floors). As someone else mentioned, the home movies can be a bit of an issue as well, any shaky-cam thing.
Back seat of cars is a problem about 75% of the time. If I sit (or lean) towards the middle, and concentrate on watching the road, I can generally control it, if the driver doesn’t suck. If the driver sucks (ie someone who hasn’t found the sweet spot in their accelerator that allows them to maintain a constant speed) I’m just screwed no matter where I sit. I’m talking about the people that are on the gas, off it, on it, off it. I can feel the sway and it kills my stomach. Front seat, it does take a crappy driver to cause me problems.
To me it feels like the problem originates in not being able to see the motion that my body feels, and generally, if I see the motion, or am controlling it (I’m fine to drive myself) I’m just fine. But when the motion is unexpected, bluh.
When I last flew into LaGuardia, with turbulence, they missed the correct approach and had to circle again to approach for landing. That was explosive for me, even with medication. The following cab ride was the absolute worst I have ever felt in my life.
On a US Navy Destroyer sailing from Boston to San Juan in a January storm off Cape Hatteras, while standing watch on the bridge. (I steered it for a while.) All exterior bulkheads (vertical surfaces) on the bridge coated with vomit from all hands. Broke the rudder, had to put ship in drydock in SJ for repairs.
On a 600-foot, 16,000 ton light cruiser in the “calm, serene” Mediterranean Sea for nearly two years. Sailing from home port in Villefranche, France to Malaga in January (twice) we heeled over about 45 degrees each way, the admiral fell out of bed, and we broke the rudder, had to put ship in drydock in Toulon for several weeks for repair. Also got queasy at other times in lesser swells. Got used to it.
I think I better not take any more cruises.
During the first trimester of my first pregnancy I would get car sick.
Under normal circumstances I don’t get sick
Never in cars, or planes (large and small). I’ve done a lot of boating (canoes, small sailboats, houseboats), some of it on very rough water on huge lakes- never a problem.
But I’ve been on the open sea twice in my life, once on a 30 foot ketch, once on a whale-watching boat (80 feet, maybe), and both times I got mildly seasick. Pretty bad headache, mild nausea. Both of those times I kept it under control by periodically closing my eyes and visualizing what the boat was going through.
.
I’ve been motion sick on virtually everything that moves-cars, trains, buses, boats, airplanes, Merry Go Rounds, etc. I’ve finally, after decades, gotten better on short car trips (with sedate drivers) but for longer trips I have to drive. I can sometimes ride a roller coaster as long as it doesn’t have too many corkscrews or loops. For plane rides I have to rely on Dramamine. Also for NYC taxi rides as I found out the hard way.
I’ve only ever gone to one IMax theater and got violently sick about ten minutes in. I’m afraid to try a 3D movie. I also was motion sick in school when using the teaching microscope if I wasn’t the one doing the focusing.
I’ve always wondered if all this is related to my poor sense of balance. I’m dizzy off and on for reasons my doctor has never fully determined.
(However tonight I’m fairly sure it was the three rum & cokes after work.)
As a car passenger - especially if I’m in the back seat.
Once took a 12 hour fishing trip in the Atlantic off North Carolina - basically spent the entire time once we were beyond the breakwater sick.
Get queasy playing (or watching others play) 1st person shooter video games.
Add me to the list of people who cannot read in a car. An mp3 player loaded with good music and an audiobook or two are sanity savers on long car drives. (Especially in the States - Norway usually has pretty scenery, at least.) Seats near the back of a bus, especially a bendy bus, are risky.
I have only experienced motion sickness on a plane during the kind of turbulence that has the cabin crew sitting down, and only felt ill on a ferry the day after a bad storm (still lots of bad swells around).
Carnival rides that involve circles within circles are automatic lunch liberators for me. A carrousel or a Dumbo-style ride that makes a single circle is no problem at all, but as soon as another circle is involved, like a Scrambler or a Tilt-o-Whirl, I’m out. I dislike certain sensations on roller coasters, too, but I wouldn’t call those motion sickness.
I can also get sick from watching TV or a movie if there is a lot of jerky motion involved.
The only reason I didn’t check “On a boat” is because I’ve never been on one. I’ll find out in a week…