My alternative title was "how a dork sits into a 12C" and as such, this is labelled as comedy.
The dealer taught me to get into the 12C by turning your back to the seat, and plopping in butt first, then turning your legs in. Getting out is much the same, in reverse, and was advised to hold on to the tub/frame. I think it's a nice conservative approach.
I've changed getting in to my "sneak in" method, where you just step a foot in, not hold on to anything, and side slip your butt into the seat, and yank your other leg in after you. I think it's quicker.
Getting out, I haven't figured out how to do it substantially quicker. However, I find that bracing your hand at the seat (instead of the tub/frame), lets you get a good push off, which moves you out of the car faster.
I'm betting you guys have found cooler ways to get in/out; would love to see what you guys have come up with. Maybe moonwalking into the seat? James Brown split and bounce back into the seat?