"Jolly Japes" are a series of experiments performed by Stephen Fry in episodes of the J Series. They were renamed "Knick-Knacks" in the K Series and "Lab Larks" in the L Series.

The first Jolly Jape was performed by Fry in the XL version of "Jargon", where a "jigger device" is shown. This device is used by Inuit fishers to lay a fishing net underneath two holes.

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