Shop towel - Used to store metal slivers and grease out of plain sight. Also good as a fan when your drill catches it and spins.
Calipers - Device used to verify that you cut the part too short. Handy for removing metal slivers from your hand; see shop towel.
Micrometer - Used in place of a C-Clamp by the uninitiated. When it's owner finds someone using it as C-Clamp, it is grounds for justifible homicide in 17 Western states.
Two Post Lift - Used to bend sheet metal on trucks with waxed or undercoated frames.
Lathe - A destructive testing machine that is also handy for throwing chuck keys.
Mill - Machine used for drilling holes EXACTLY 0.200" off desired location.
Jig Bore - Like a mill, but calibrated to miss it's mark by 0.02500"
Burr knife - A toy for the machinist, it will hide until you don't need it anymore, then miraculously reappear.