Mast climbing when singlehanded on the sea - is that heard off?

Hi,
I recently sort of got in touch with someone who wants to prepare for singlehanded mast climbing while at sea. Did you ever heard about such experience? I presume its extremly rare.

PS.
I am not asking how. Just asking if anyone heard about such event :)
Thinking in physics a heavy person at the top of a long mast could be iffy., especially if the boat rolls to the side slightly.
 
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