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Hey you! Speccy 4-eyes! Speccy spec specs!
When you've got a smudge on your glasses, is there a passing millisecond where your entire being is filled with the fear that the mark isn't on your bins but actually on your eyeball?
There is for me.
A millisecond isn't really long enough to worry about it though, and every time so far it has turned out to be a fingerprint on the lens. Phew, eh?