A viral video—showing a person organizing a box of nails by simply shaking it back and forth and side to side—has people crying foul, claiming the video has been reversed. The video appeared on reddit earlier this week and people immediately questioned its legitimacy.

Internet detectives were quick to reverse the video, and some pointed out that it actually proves the video is genuine because: ‘when he tilts the box away from him the nails slide up towards him.’