Always wear underwear in public, especially when working under your vehicle. A story was posted in a newspaper a while ago of a Brisbane couple who drove their car to a shopping center, only to have their car break down in the parking lot. The man told his wife to carry on with her shopping while he fixed the car.
The wife returned a while later to see a small group of people gathered near her car. On closer inspection, she saw a pair of hairy legs protruding from under the chassis.
Unfortunately, although the man was in shorts, his lack of underpants turned his private parts into glaringly public ones. Unable to stand the embarrassment, she dutifully stepped forward and quickly put her hand up his shorts, and tucked everything back into place.
On returning to her feet, she looked across the roof of the car and found herself staring at her husband who was standing idly by watching.
The car mechanic however, had to have three stitches in his forehead.