We took the opportunity of B wanting a bottle of juice with a straw to sneak in some counting practise. I think the sheer absurdity of it made him go along with this but he had a whale of a time.
I started off with one straw and said "Can you drink with one straw?" and counting it. I then repeated this until we got to 10 straws. "No counting!" didn't come up at all for once as he was so busy giggling.