I used to think Dell was just stupid, but now I think even less of them:
AN INQUIRER READER attending a conference in Japan was sat just feet away from a laptop computer that suddenly exploded into flames, in what could have been a deadly accident. Gaston, our astonished reader reports: "The damn thing was on fire and produced several explosions for more than five minutes". Should you witness such an event, his advice is, "Don't try anything courageous/stupid, stay away, away, away!"
"For the record, this is a Dell machine," notes Gaston. "It is only a matter of time until such an incident breaks out on a plane," he suggests. Our witness managed to catch all the action in these amazing pictures.
"Fire extinguishers leave a mess on your suit and belongings; pack your stuff (if you can) and leave, leave, leave!" he advises.
We don't have any further details of the model of the computer in question. In light of the evidence, however, we'd suggest you avoid actually using a laptop on your lap. Ouch.
(source: "The Inquirer", on the internet somewhere :P)