Stupid, ignorant, careless...
Late at night I was checking over my wife's Boxster before she planned to take it for a day-long drive. I noticed that the windshield washer fluid was empty.
In the dark.
In the driveway.
In a hurry.
I unscrewed the cap.
I poured the washer fluid.
...into the brake reservoir.
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I realized what I was doing the moment it started to flow from the bottle, but it was too late. I could not make it unflow.
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I hate to waste a good flush, so today I am putting the repainted calipers intended for my car onto hers.