A man in California had been wondering who in his family was not flushing after using the toilet because everyone claimed to be flushing.

To capture the culprit, he set up a video camera in the bathroom overnight and what he got surprised him, the Metro reported.

"I'd noticed that someone had not been flushing the toilet in one of our bathrooms. All of the family members claimed to be flushing," wrote the man on the YouTube video's description.

Since all of his family members were flushing, he suspected that the cat might be using the toilet because he "noticed that the cat box was suspiciously clean (with the exception of feces)."

Hence, the video proved it was the toilet-trained cat, NY Daily News reported.

The video shows the cat making its way onto the toilet seat before using the facility. The owner doesn't know when the kitten started using the toilet since his video is entitled, "My cat has been peeing in the toilet for god knows how long?"

Obviously, the cat is self-trained manifesting how smart this Californian kitty is.