Have you ever watched a movie and thought, "Wow, this holds up really well?" The reason is because of CGI, or a lack thereof. CGI effects are notorious for aging badly; nothing dates a movie quite as badly as CGI does. If you look back to the original Jurassic Park, it holds up great, mostly because the dinosaurs were animatronic rather than CGI. These are our picks for the worst CGI effects in popular films.