A man goes into a cinema with his dog to watch a film. It's a romantic comedy and when there's a funny seen the dog starts laughing. A little later on there's a sad part and suddenly the dog starts crying.

This goes on throughout the entire film, laughing and crying at all the right places. A man sitting a few rows back has witnessed the entire thing and decides to follow the man out.
In the foyer, he approaches the dog owner and says, "That's truly amazing!"

"It certainly is" The dog owner replied, "He hated the book!"