Every apple laptop I have owned plus my apple tv all spark whenever I plug them in. From a G3 iBook to a brand new intel macbook.

You mean at the wall plug end? If so, your outlet might not be grounded.

fiatmacadam sez:

Heh. Yet another example of not knowing when to quit tweaking the product. Apple decided to make adapters with transparent cables.

This would generally be the iBook and Titanium G4 saucer adapters with tranparent insulation on the cable to the wall and the cable to the a/c jack.

I have seen both ends spark on heavily used (physically thrashed) adapters.

I would worry more about the cable that plugs into the wall; this could a real fire hazard. On the other hand, if Apple had made the cables opaque, this issue probably wouldn't have surfaced.....

"You mean at the wall plug end? If so, your outlet might not be grounded."

When if you aren't using the adaptor's extension cord and are just plugging it in directly using the little folding two-prong attachment, there is no ground conductor. So whether your outlet is grounded becomes irrelevant. That's when mine sparks, when I'm using that two-prong attachment. Yet as far as I can tell I'm not included in this settlement because mine was an original adaptor, not a replacement.