If you find something you know they'd really like, then give it to them. It's better than getting something last minute that has no meaning to it. Most won't mind just getting a 'happy birthday' and seeing you.

[ Though, watching some of the other guys while he explains gets him to update his answer. ]

But I guess it depends on the person.

[ He's not naming names, but there's one in particular you'd probably be best off getting ANYTHING, lest you get an earful. ]