Aviation Metal Snips: See Hacksaw.
Battery Electrolyte Tester: A handy tool for transferring battery
acid from your car battery to the inside of your toolbox, after
determining that your battery is dead as a doornail, just as you
thought.
Bolt/Stud Extractor: A tool that snaps off in bolt holes that is
ten times harder than any known drill bit and is therefore
impossible to remove.
Craftsman 1/2 x 16-Inch Screwdriver: A large motor mount prying
tool that inexplicably has an accurately machined screwdriver tip
on the end opposite the handle.
Drill Press: A tall upright machine that is useful for suddenly
snatching flat metal bar stock out of your hands so that it smacks
you in the chest, sending important things you've kept piled safely
nearby flying to the far corners of the garage.
Eight-Foot Long Douglas Fir 2x4: Used for levering a car up off a
hydraulic jack.
Electric Hand Drill: Normally used for spinning steel pop rivets
in their holes until you die of old age. It also works great for
drilling roll bar mounting holes in the floor of the car, just
above the brake lines.
Gasket Scraper: Theoretical uses of this tool include spreading
mayonnaise, although most find service as an extraction tool, to
remove dog doo off your shoe.
Hacksaw: One of a family of cutting tools built on the Ouija board
principle. It transforms human energy into a crooked,
unpredictable motion, and the more you attempt to influence its
course, the more dismal your future becomes.
Hammer: Originally employed as a weapon of war, the modern hammer
is used as a kind of divining rod to locate expensive car parts not
far from the object we are trying to hit.
Hydraulic Floor Jack: Used for lowering your car to the ground
after you have installed a set of lowering springs, trapping the
jack handle under the front air dam.
Mechanic's Knife: Used to slice open and slice through the
contents of cardboard cartons delivered to your front door; works
particularly well on boxes containing convertible tops or tonneau
covers.
Oxyacetylene Torch: Used almost entirely for lighting those stale
garage cigarettes that you've kept safely hidden away for years on
end, because you can never seem to remember to buy fluid for that
Zippo lighter.
Phillips Screwdriver: Normally used to stab the lids of old-style
paper-and-tin oil cans so oil is splashed on your shirt. It can
also be used effectively, as the name implies, to round-out
Phillips screw heads.
Phone: Used to call your next-door neighbor to see if he/she has
another hydraulic jack you can borrow.
Timing Light: A stroboscopic instrument for illuminating grease
buildup on crankshaft pulleys.
Trouble Light: A mechanic's portable tanning booth. Also called
a "drop light," it is a good source of vitimin D, "the sunshine
vitamin," which is not otherwise found under cars at night. Health
benefits aside, its main purpose is to consume 40-watt light bulbs
at about the same rate that 105-mm howitzer shells might be used
during, say, the Battle of the Bulge. It is more often dark than
light; its name is therefore somewhat misleading.
Two-Ton Hydraulic Engine Hoist: An indispensible tool for testing
the tensile strength of ground straps that you've forgotten to
disconnect.
Tweezers: A tool used for removing Douglas Fir splinters.
Vise-Grips: Used to round off bolt heads. If nothing else is
available, they can also be used to transfer intense welding heat
to the palm of your hand.
Wire Wheel: Cleans rust off old bolts and then throws them
somewhere under the workbench (in this respect, it is a cousin of
the Drill Press).
Zippo lighter: See Oxyacetylene Torch.