Cats have long entertained humans with their adorable antics and cleverness. Our feline companions are highly intelligent compared to most other species in the animal kingdom, and this intelligence certainly keeps us on our toes when we have cats as pets. This could not be truer for the man in the video below, who installed a cat door for his beloved Philo, the cat. 

After toiling away for an hour and a half to get the cat door in place, the man decided to film Philo's first reaction, which can be seen in the video below. Philo - in true cat form - has very little interest in the cat door and proves that perhaps his owner has been underestimating him this whole time.