For me “How long could I get away with driving like an ABSOLUTE ASSHOLE all the time before I lost my licence or had an accident.” Speed limits, red lights, stop signs… forget them all. Every day I have to drive sensibly and obey the law because without my licence I dont have a job, and every day I see at least one person driving like an absolute moron and I wonder…
Isolate a bunch of babies together, with food etc, and see how they develop their own language and society.
Not exactly the same, but suggests probably it would not turn out well. https://thebrain.mcgill.ca/flash/capsules/histoire_bleu06.html
I silently lament that this experiment cannot be done at least once every couple weeks. I think it would be the most fascinating experiment to observe. Watching a new language develop naturally in real time!