Feather-light and proudly goofy, this Jackie Chan action comedy appears to be aimed squarely at under-12s, smutty gags about kinky bimbos, tasty buns (including Chan's) and Jennifer Love Hewitt's breasts notwithstanding. Jimmy Tong (Chan) is a loser, sweet-natured but clumsy, uncoordinated and tongue-tied around women. "I thought you all knew martial arts," says a fellow cabbie, as Jimmy is getting his ass kicked by the angry bike messenger he just doored. "Not all Chinese are Bruce Lee!" Jimmy gasps. (That sly allusion to Chan's own early career is as clever as it gets.) Jimmy is a world-class taxi driver, though, and that skill attracts the attention of Steena (Deb...