The Piranha Brothers reference article from the English Wikipedia on 24-Apr-2004
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Piranha Brothers

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"Piranha Brothers" is a Monty Python sketch covering the exploits of one Doug and Dinsdale Piranha, who would use their skills of intimidation, violence (including nailing opponents head to the floor), and sarcasm to bring the city to its knees. Dinsdale was a gentleman. And what's more, he knew how to treat a female impersonator.

Dinsdale was afraid of Spiny Norman, a hedgehog that would grow from anywhere between 2 and 200 feet long, depending on Dinsdale's state of mind.

Spiny Norman (created by animator Terry Gilliam) goes around in this sketch shouting out "Dinsdale" at interesting moments. The character makes a brief reappearance in a later episode.

The sketch was obviously inspired by the real-life story of the Kray twins.