Originally Posted by
tandempower
That makes me wonder whether you could seal them up well enough to fill them with water and use them as big aquariums without them leaking. You could feed the fish through the sunroof.
Of course when I just googled it, it's already been done:
I wouldn't really do that given a car with an engine and gas tank etc. polluting the water pretty bad especially a small lake. Your children might look like martians. But a car body? Probably at least sort of OK.