Recharacterisation
A fear that lives, loves, survives and flourishes in the febrile imagination of a young legal clerk, and of which many never entirely grow out, that Arthur might be regarded by the authorities who watch over us as Martha; Glen might be seen as Glenda, a synthetic prime brokerage trade be deemed to be a (taxable) cash equity trade, that a credit derivative ruled an unregulated insurance contract and so on and so on and so on.
Don’t scoff: your livelihood depends on chicken-lickeny risks like this being taken seriously.