I usually get a gift for DH and DS (16) on behalf of our cat. It is a chance for us to have a laugh as the cat is pretty grumpy, self-absorbed and in reality would not lower himself to giving a gift to a human- but we all adore him and let him rule the roost.
Over the years I've bought funny books and T-shirts.
I'm struggling for ideas this year, google hasn't helped so I'd love some inspiration.