Wasn't there a great thread on SCF of members "bloopers" ?
I recall it was extremely funny,
we have all done similar acts, I have sliced stamps in half,
ripped corners, pulled perfs, the whole gamut.
My latest, and recently was removing some "blind perfs"
(you know, those little dots of perforations that linger on the stamp)
I thought it made the stamp look nicer and well rounded
I scraped a few dots away with my long nosed tweezers, then I scanned my result

Don't do it.