This is the hilarious moment a woman pranked her grandmother by showing her a picture of a gorilla after taking her photo.

Pornanong Chutiyon played a prank on her granny, Thum, 69, with a funny picture of an ape at her house in Nakhon Si Thammarat, Thailand, on November 20.

Footage shows the playful lady pretending to take a picture of Thum by turning the flash of her phone on three times. The elderly woman then posed with her tongue out as directed by Pornanong.

She then showed her a photo of a gorilla sticking its tongue out - surprising the pensioner who at first thought it was her own picture.

Pornanong said: 'I prank my grandma regularly, occasionally receiving scolding in a lighthearted manner from her.'