Why it worked
The video likely went viral due to its bizarre and unexpected imagery, combining a familiar animal with an unnatural, surreal feature (the extremely long tongue) in an unusual setting (a river). This creates a strong sense of curiosity and disbelief, prompting viewers to watch and share.
Summary
A surreal scene unfolds in a muddy river as a cow-like creature with an impossibly long, pink tongue emerges from the water. It appears to be tethered by a rope to a small boat in the foreground, while its tongue reaches towards the branches of a large tree on the riverbank.