I know this is an older post, but it made me smile and laugh about the resilience (i know I spelt that wrong!) of all us CCers and I thought I'd add my first cake disaster story.
It was the orange 3d bunny cake on a oval cake in my pics. I had borrowed my boyfriends car since it was hot out and his has A/C (mine doesn't) and is a hatchback with a flat trunk which the A/C will get to. But his car also handles much better than mine... and what I didn't realize is that going around the cloverleaf entrance to the highway, I was going much much faster than I realized (it was soo smooth, I felt like I was going really slow! lol) and sure enough.. plop, the bunny fell off to the side taking part of the chocolate base cake with it when the dowels fell out. I pulled over on the side of the highway, took a look and realized I could repair it on site at my friends house since I didn't want to have to drive that cloverleaf again if I went home first to repair it (thank goodness for CakeCentral, I knew to take a repair kit with me!)
After 2 drinks to settle my shaky hands at my friends insistence, my friend let me at her kitchen to repair the cake. It came out okay, the green grass had some chocolate crumbs in it and the bunny's tail was no longer as fluffy and a few flowers were missing.... and my friend still loved it. She had no problem taking it the next morning for her neice's birthday (with tons of warnings about stability!)
It was such a hit, they ordered another 3D rainbow bunny cake for her birthday this year... and instead of using a wooden base, I used 2 layers of foamcore and drove 2 dowels all the way through the bunny, base cake and board to help stabilize it and it delivered perfectly without a wobble.
Lesson learned: 1 1/2 inch cake DOES NOT provide enough depth to stablize the dowels for a 4" tall 3D bunny!
I've been amazed at the transport that I've pulled off before i knew how to do things properly and figured that my time was coming:
3 tier topsy turvy travelled 20 minutes by car with me holding it in my lap on the Wilton smaller turntable (NEVER AGAIN!)
2 cakes each with 2 mini stand-up bears ontop of a 9" cake with NO support underneath travelled for 3 1/2 hours in the trunk with no A/C (I'm amazed they made it)
baby blocks stacked (2 bottom, 1 top in middle) with no supports travelled for 2 hours as well - some on gravel roads, and the base 2 cakes weren't even levelled (This was before I figured out that I could level cakes and ice them without getting all the crumbs in, these blocks looked horrific.)

I've learned so much here; enough hopfully to avoid more cake disasters than necessary!