i had this happen with an ego when i accidentally bumped the cord while charging it on top of my sofa (yes, i'm a complete idiot), which caused the button to accidentally get depressed...sparks went flying, it made a horrible zapping noise, smoke billowed, it stunk to high heaven, and scared the crap outta me.
(needless to say, i no longer charge my pv's on top of my sofa
)

(needless to say, i no longer charge my pv's on top of my sofa