'That '70s' effect

I didn't watch so much as five minutes of Fox's "That '70s Show" during its protracted run. Every commercial I ever saw for it made me taste bile, to put it kindly. And I'd like to pretend the 70s didn't exist, fashion-wise, in the first place.

But the show's breakout stars, Topher Grace and Ashton Kutcher, have been having a hard time transitioning to big-screen roles.

Grace's unexceptional box office tallies for "In Good Company," "Win a Date with Tad Hamilton" and "P.S." have stalled his chances at film stardom. (Starring in "Spider-Man 3" was a push -- no one actor would drag that film up or down)

As for Kutcher, well, he tries yet again this weekend in "What Happens in Vegas," a new rom-com co-starring Cameron Diaz. The actor's "Guess Who," "The Guardian" and "A Lot Like Love" all underperformed at the box office, so teaming with the dazzling Diaz makes sense. And they sure look good together.

But while Grace can be an enigmatic presence in films, Kutcher still looks like an over sized kid to me. Just don't buy him as an adult, and his choice in projects makes me feel like he's punking himself. And it has nothing to do with his cougar courtship of Demi Moore.