Cthulhu ski mask.
Or, presumably for copyright reasons, Unisex Barbarian Knit Beanie Octopus (€4 – €10+P+P) from Amurleopard.
Available in various colours: green, blue, eternal torment, etc.
Michael O’Riordan writes:
Pic of the new bridge just a few minutes ago. Not sure what happened but I think Cthulhu is trying to get out.