Yeah ... the only boats I've ever been able to persuade to do that, on demand, have not had enough residual righting moment for even a small child at the masthead, let alone a big lad like Alex
And on that note: did you see the Aussie version?
Google "Boxing Kangaroo" and "Mast Walk" if you didn't ... well worth a look, and make sure you watch right to the end ...
(NOBODY takes the piss quite as adroitly as a
funny Aussie)