Even British wrestlers know that, which is why whenever any of them ever go and ply their trade in America, they're bound by unspoken duty to immediately change their name to Duke Spiffington and prance around in a monocle to Land of Hope and Glory.
There is a great unspoken paradox about the current politico-fiscal crisis gripping the Republic of Ireland.
The language of clothes is carefully coded as a result of thousands of years of social, cultural and religious lore, and the unspoken rituals that dictate what we choose to wear.
Take NHS Change Day, which is surely the ultimate symbol of the power of a workforce inspired by colleagues and given the unspoken freedom to try something different.
"There is an unspoken truth that too many countries just don't want refugees in Europe at all," said one of the highest ranking EU officials dealing with migration.
Of the original Ashes squad Stuart Broad is injured, Jimmy Anderson visibly exhausted, Alastair Cook in the worst trough of his career, Matt Prior dropped and Kevin Pietersen, who received little support from Giles on the day he was announced in a provisional squad for the World Twenty20, in a kind of unspoken international limbo.
Sammer wasn't wrong, too, generally speaking but some truths are better left unspoken or should at least be delivered in more diplomatic fashion.
The unspoken dress-codes of academia are simply a reflection of the wider policing of women's bodies in other professional contexts in western society.
She's talking as if we're circling round some dangerous unspoken subtext and we both know it.
There is no mention of the fact that they forced guests Janet Street-Porter and Trinny Woodall into performing some sort of veil-based dance in the same photos, but you sense it's the great unspoken.
A lot of it is unwritten, unspoken.
