Curdle is distinctly unimpressed at being used as a card stand. Curdle does not give a rats ass if Boy's mum has a happy birthday or not, she just wants to nap undisturbed.
Curdle is a selfish madam. Boy's mum constantly bestows cat treats upon her, the least she could do is put a paw print signature on a greetings card. But nnnnnnno, Curdle is to tired after her busy day's repose and so must not be disturbed.
They say that pets take after their owners, and, well....