(This is indeed the card my mother has received, with comment inside telling her that, aha, I didn't forget. It possibly only makes sense if you know that my mum is not terribly impressed when I drop Ts and say 'innit', but nonetheless will laugh when I use them to express a sense of 'duh'. And will use them back at me if I say something daft.
Also, it was either this or a card that made me sound like I was five years old, a card that implied my mother spent more time baking and cleaning than managing an office, or a card that reckoned Mum drank too much wine. So it wasn't much of a choice...)