[weegee]

There is enough power in the lights in the bathroom to trigger an explosive. A couple of wires and you can make a circuit. And guess what, you can use the headphones provided for entertainment as a source for the wire.

Heck with some explosives, you don't even need an electrical circuit to set it off. I strong blow can set off a lot of stuff.

They make announcments about attempts to tamper with the smoked detector in the bathroom. Not sure how much of that is triggered with such devices.

[MineralMan]

"They make announcments about attempts to tamper with the smoked detector in the bathroom."

That's to keep you from disabling it so you can smoke a cigarette. We can't have any filthy smokers on our airplanes, you see.

[taxcontrol]

Yeah, and I really doubt that someone intent on blowing up the plane is really going to pay attention to that announcement about it being against Federal law to tamper with a smoke detector. Most smoke detectors are in the 3 amp range... that is enough juice for many detonators... but I don't know about igniting raw explosives.