Wanna know something really useless?
An east German car (Wartburg) had two buttons on the dash board. With one you could check if the warning light that shows the level of oil pressure in the car is working (you turned the swithc and saw if the light lit up). The other button was there in case the first button failed (when I read the manual I couldn't stop laughing - won't ever forget that car,... had it for 2 years).
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