I've been trying to figure out what bothers me about the TV commercials for the new movie 17 Again, and I finally know what it is: it's just not believable.

I know, I know, of course a movie that features a 37-year-old man somehow becoming a teenager again through some complicated process (from the previews I think it involves a whirlpool and/or lightning) isn't supposed to be gritty realism, but I'm talking about the cast members.