Some are calling it a “ghost,” while others are dismissing the shadowy figure as a reflection — but no one really knows for sure.

The video footage, taken during a match at the Hernando Siles Stadium in La Paz, Bolivia, shows an unidentified figure running quickly through the stands and seemingly going right through a barrier at a steady pace.

The video has gone viral as people search for a reasonable explanation for incident.

Do you have a theory?

Watch and decide for yourself:

(H/T: Bleacher Report)