you had your turn signal on. When you turn the car off and had the turn signal stalk in the up or down position....it turns on the marker for parking on the street. When you took your car out for a spin, the signal stalk returned itself to the default position which turned your parking light off or whatever the specific name for the light is called

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2004 BMW 745Li (Sterling Grey)
2006 Porsche Cayman S (Seal Grey)