Blue Mouth Sweets.
Classic confection which makes your mouth go blue.
Include them in a selection of sweets and your victim will never be able to tell the difference! They won't be able to hide the fact that they have fallen for this prank since they will be walking around with a bright blue mouth after they suck on one of these.
Why not try the prank out on one of your friends.
Three wrapped sweets that turn mouth blue.
Ingredients: Sugar, glucose, glucose syrup, colouring (E133).
Not recommended for children under 5.