Discourse.net

No, it's not the punchline to a joke. It's real: Dell laptop explodes at Japanese conference.

As the article, illustrated with photos of a brightly burning laptop, helpfully points out, "It is only a matter of time until such an incident breaks out on a plane." And it even more helpfully concludes, "In light of the evidence, however, we'd suggest you avoid actually using a laptop on your lap."