Hardtop convertible Mustang???
I love finding weird stuff like this on the internet. I first stumbled across this over at All Ford Mustangs, and then found the original article which goes into more detail. Long story short, engineers take a 66 Mustang and give it a retractable hardtop. I really suggest you read the full article over at OLDCARSWEEKLY.com. Below are some teaser pics!