oftenly its a mousemat problem... mine goes nuts occasionally (oftenly costing me online frags)
stay away from reflective plastic, large areas of the same colour, or dense repeated patterns.
i'm guessing the worse would probably be a Reflective Black&White Chequered noise mat ... athough i've never tried one so couldn't tell ya.
most mats they sell now are made specially for optical mice in mind, with sepecial patterns and a dull top, however using it directly on the desk oftenly is a good option
that aside i think Solidz has been smoking something bloody strong recently (i mean how many freaky posts do we have to put up from him?)
Within the Epic battle of the fates the Shadow and the Angel will meet. With it will harbinger the very fight of good vs evil!