My family watches a lot of British miniseries dramas. Over time we've developed a sort of game that you might call "Haven't I Seen You Before?" It consists of identifying actors by the other characters they've played, and then pointing it out before someone else does.
Oh hey! I recognize that guy from Cranford/Horatio Hornblower/Sense and Sensibility!
Even Jared is in on it now. This weekend we were watching Little Dorrit when he suddenly paused the DVD and exclaimed, "Wait a minute-- didn't she play Persephone in the new Upstairs Downstairs?"