Cthulhu Insanity Dice are a pair of large d10s designed to speed up the resolution of sudden sanity-blasting effects in your game, without having to breakout the rulebooks and interrupt the flow of the action.
Already funded on Kickstarter, the dice - from Dark Cult Games - are said to be "compatible with almost any RPG, in particular Horror genre RPG's such as Call of Cthulhu, Chill, Dark Conspiracy, Cryptworld and others. They are also compatible with any game where you might lose control of your characters actions due to some mental trauma."
For a dice fetishist like myself, who is always keen to find little tricks to maintain the momentum of his games, this was a no-brainer, especially with the very affordable buy-in and sensible shipping costs.
A pair of dice can be yours for as little as $13 (plus postage), so check out the campaign's Kickstarter page to view the range of investor incentives, add-ons etc
The campaign runs until the end of August, with the dice currently due to ship in November.