TROUBLE LIGHT: The mechanic's own tanning booth. Sometimes called a drop light, it is a good source of vitamin 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 105mm howitzer shells might be used during, say, the first few hours of the Battle of the Bulge. More often dark than light, its name is somewhat misleading.
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Also used to shine into your eyes with the intensity of a 500W bulb, causing you night blindness!!!
ROFLMAO
All good daffy-nitions!!!! ethere, done most. More good ones, GARY!!!