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in the early 70's my father bought a brand new car for exactly $2500. (even had the optional AM radio!!)
being a salesman he clocked it in just over 2 years and traded to the new model.
about 15 years later he said he saw it on a used car lot for $2500. yeah he had a good memory for the plate numbers, had a lot of cars, could recall every one
also had exactly 1 mobile phone, with a phone number he never remembered,
... then again that made sense: only ever had it's battery charged up exactly once
after many otherwise intelligent sounding suggestions that achieved nothing the nice folks at Technet said the only solution was to low level format my hard disk then reinstall my signature. Sadly, this still didn't fix the issue!
I've encountered a weird one. But I don't remember if it was a surrogate or not. I just remember it didn't print to the console properly (it cooked it) or didn't save to source as a literal value or something.
It came up as whitespace, but only when I used these huge "not ranges" which are like [^a-z] (anything but a lower case letter)
that "anything" part created ranges all throughout the 16-bit unicode spectrum.
And that's when I ran into issues with one whitespace character.