Heathrow Director: The year, if my memory serves me well, was 1974; the place was the ATC College in Melbourne and I was a member of the ATC Long Term Course 30 which claimed the record! We photographed the result and sent it off to Flight International, where, I believe it was later published.
Fingernails, as such, were never in it, but standing on a desk with arms above the head was!
Can't say I can remember the exact number involved in this scientificly important experiment, nor the number of cleansing ales required to lubricate the joints, but it was good for a laugh!
Not now possible with TAAATS, technology just ain't fun anymore!
Fingernails, eh? Trust the Poms to do it the hard way!!!
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Be CAREFUL out there!