Watch This Child's Reaction To His Grandad's Roar

A video showing a child absolutely terrified of his grandad's roar has appeared online.

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The short clip shows the baby boy's mother call his name, to which he excitedly comes running down the hallway with his arms and legs flying everywhere.

However when his grandad lets out a loud bellow, the adorable tot is so frightened that he jumps and turns around in the other direction.

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The look on the child's face really says it all as he goes into a state of complete terror.

Bless.