I have a TiBook 15" 1Ghz. The bottom half of the casing (the darker grey) seems to convey a constant electrical charge. if I touch it with any tender skin (eg upper legs - which brush it often when wearing shorts and sitting with my leg up as i do at my desk) it gives a contanst stinging zap. (This doesn't happen when it's grounded by my hands resting on the top (next to the touchpad)) Does everyone/anyone else's TiBook (and AlBooks?) do this? Is this normal? or a problem?