Easiest question for me to answer.
One of my earliest memories was getting a kit for Easter. It was hidden in the clothes dryer, my brothers and I had to follow clues to find it. They got Monster kits, I got what was perfect for my interest at that time, the house we were in puts me at either 4 or 5. I still remember being amazed at the concept of a model, cracking the box and assembling it.
Of course, what the actual kit was was lost to me for years, I just remember the subject and that it was blue. A few years ago I bought a book on Aurora and in the list of kits I found it. It's from '66 and undeniably the exact kit, since this would have been '69 or '70 and it was the only kit produced of this subject, ever.
The Aurora Demolition Demon. A 1/32 kit of a '56 Ford that was crunched in a derby. Molded all bent and twisted.
I've been looking for years now, I've only seen one come up for sale and it was last month. It was an incomplete, half assembled kit. Painted and missing the trunk lid, but I still was interested in it.
I put a cap of $125 in my head and it was going for $32 early on. Then I talked myself out of it and skipped watching it. it sold for $112, but probably would have went higher if I got in the mix. Shortly after that, I realized I really should have gone for it and will relentlessly hunt for one from this point on.