A strange video was posted on TikTok, which one commenter called “the most convincing paranormal video he’s ever seen.”

The surveillance footage was shared by a user named shannyfantg. The video shows two dogs sitting in cages. At first, both pit bulls bark anxiously, then suddenly go silent and freeze in place.

Then, the collar on the black dog unbuckles on its own. The terrified dog presses against the bars of the cage, and the collar slips off its neck.

In the comments on the video, the owner (apparently American) wrote that it’s a poltergeist living in her house. She claims that the spirit occasionally knocks things over and opens and closes doors in the middle of the night.

In 4 days, the viral video has gained nearly 12 million views.