Lots of interesting thoughts here but I am curious as to the definition of no tools - does this mean I don't have at least minimal EDC (say a knife and/or firestarter) with me?

Some things aren't practical without tools or even with the tire change kit that comes with most cars. Good luck even getting the tires off with the tiny little lug wrench most cars come with these days. Getting into the spark plugs or headlights (or disconnecting hoses etc.) is just not really an option without at least a knife or multi-tool. Given those there are lots of options. Without them, well, there are some things that brute force and ingenuity will get ya but the best toys need tools to access.

Realistically my minimal car kit (in every car I own) would let me totally dismantle your typical sedan. Putting it back might require some additional tools and maybe some replacement parts.

- Eric