Director Ivan Reitman practically remakes his own Ghostbusters with this silly comedy about a meteor that hits Earth, carrying microscopic life forms that evolve beyond the what the physical properties of the universe allow. No matter; implausible premises are fine if they're dealt with plausibly, or, in the case of a comedy such as this, in a humorous manner. Well, the movie does induce some smiles, but nothing in it is outright funny. The climax, in particular, amounts to no more than one giant body function gag. Har har har.