What movies use CGI that audiences would never suspect?

I was watching a documentary on the making of Brokeback Mountain and I was shocked to see Ang Lee used CGI to add stars to the sky, deepen the blue of the rivers, and even clone sheep to increase the size of the flocks. It’s a film I would never have guessed in a million years to use CGI because it looked so real, and I’m wondering what other films have pulled the wool over my eyes. 🐑