The latest movie to prompt this kind of behavior is G-Force. The heroes are a pair of guinea pigs.
Here is a CBS article that at least explains basic care for guinea pigs.
Having cared for guinea pigs at the Seattle Animal Shelter, I can tell you that guinea pigs are certainly cute. They are also the messiest animals on the planet. And, they require a lot of care. Hopefully parents will think about that before they give in to the pleas of kids who see this movie.