So, what's the biggest thing you've carried in your Insight?
I stumbled upon a craft show in 2000 and bought a rocking chair. It wouldn't fit in the back with the lid closed, but I found a way lay it on its side, aim the top of the chair back through the passenger door, then between the seats while aiming the rear of the two rockers above and below the shifter. It fit.
I couldn't shift into 4th gear, but that wasn't a problem getting home. I just went from 3rd to 5th. All doors and windows closed just fine. It's a terrific rocking chair, and a fine car.