My father, a submariner, was often out at sea for family occasions. As a result, he sometimes forgot about them.
One year he missed my mother's birthday. Unfortunately, it was impossible for her to tell him how furious she was since the Navy screened all messages, editing out anything that could be considered disturbing to the men on board.
However, my mother was not so easily defeated.
She sent my dad a message, thanking him profusely for the lovely birthday present he so kindly remembered to send her. Mom went on about how special Dad had made her feel by his thoughtfulness, and how grateful she was for his generosity.
Navy personnel forwarded the note. Dad got the message and never forgot my mother's birthday again.