"where_not_in" -- Am I an idiot?

[eluser]Daniel Walton[/eluser]
Hi, i'm using the active record class as such:

Code:

$this->db->where_not_in('id', $id);

...

Code:

$this->db->get('the_table');

Which should be excluding that particular ID from the result, right? Wrong - all ids are coming back What could be wrong?