Have you ever looked at a particular actor and thought, "Why, he/she is the spitting image of this other actor/actress I love so much! This can't be a coincidence. If I didn't know better, I'd say they were separated at birth!" And the idea fascinates you so much that you're compelled to check the IMDb, only to find that the two actors are not, in fact, related in any way?
How can this be? More importantly, why hasn't anyone had the bright idea to cast these folks as family members in a movie before? This is especially distressing once you realize that Hollywood has a long and tortured history of casting people who obviously have no business being siblings. Kurt Russell and William Baldwin in Backdraft, for example (wouldn't it have been simpler to hire, I don't know, Alec Baldwin as Billy's older brother?). Or Denzel Washington and Keanu Reeves, cast as (half) brothers in Kenneth Branagh's Much Ado About Nothing (yeah, right). The eclectic ensemble of 2003's Cheaper By The Dozen are clearly the product of an extramarital affair or two, with blonde, brunette and redheaded children all running around under the same roof. And can anyone point out the family resemblance between Arnold Schwarzenegger and Danny DeVito in Twins? (Okay, so that last one's a joke).