Scaring a grandmother to within an inch of her life should not be this funny.
But this video has captured the hilarious moment a woman fell backwards in fright when she thought she was about to be attacked by a shark.
Her sneaky relatives can be heard egging the gran on as they tell her to ‘keep touching the glass’, knowing that Jaws is lurking.
As the poor woman agrees, smiling nervously, a huge Great White lunges at her and cracks the glass with its snout – causing her to fall backwards in shock.
Luckily, she takes it in good humour and laughs off the prank to the joy of the cackling pranksters