My first Z (75 280) had the jury-rigged bungee cord battery hold downs. First time I went out and got on it a little bit, it quit. Being young and relatively new to cars, I tried to just restart it... nothing but a bunch of smoke. Next I tried to pop the hood, it suddenly weighed about 30 lbs more.
Seems that as it took one of the turns to hard, the bungees slipped and the battery bumped up and the terminals had both hit the hood and spot welded themselves to it.
The smoke was a the positive battery cable melting or maybe it was the battery... due to the horror of it all, I think I blocked most of what I saw after realizing what I had done.
Glad I can laugh (?) at it all now... I think the car hated me after that... no actually I'm sure she did...
Jay