My favorite times in my Opel GT were "possum dodging" in the middle of the night along the backroads of rural north-central Florida. If I drove like an idiot, my GT would develop some minor mechanical issue (like a loose spark plug or moisture in the distributor) and force me to drive home very sedately.
Here is a basic review of my old 1973 Opel GT:
Car Review: the 1973 Opel GT - Associated Content
I hope that someone is out there restored it and is having fun with it still!