In my Auto Shop class in high school, we learned to perform basic automotive maintenance on a 1982 'Vette. (Sadly it was a Chevette, not a Corvette.) The benefit of the old clunker was that you could easily reach everything in the uncramped engine compartment and undercarriage. The crowded innards of today's cars, in contrast, seem designed to make it impossible to reach every last fastener.
Enter the revolutionary Kirk Wrench. Originally designed for plumbers to get at shut-off valves behind toilets, this wrench is actually less of a tool and more of a system of interconnecting parts, allowing plumbers and automotive mechanics to get into some tricky-to-reach areas. Check it out:
The unknown inventor (Mr. or Ms. Kirk?) has patented the design, but as far as we can tell it isn't in production.