I am really baffled - can you help explain this?

My experience: Me and my sister just got home, and we went into my room--I cant remember why and my amp appeared to be left on, the lights were on so I thought I would turn it off but when I went to the switch it was already off. So I turned it on then off again and this incoherent death metal type voice comes out the speakers. Me and my sister just look at eachother and say WTF!

Electronics make odd noises some times

I wrote this post several months age and received some excellent replies and as a result I gave up on my samsung and bought a cheap something just to tide me over. Anyway just a couple of days ago I was going through my gear and came upon the old samsung and on a whim plugged in onto the charger and zammo its working perfectly now! In fact I've ditched the cheapie and returned to using the old favorite. But how can this be I ask myself? How can it be working perfectly when I was convinced by the replies to my post that it was caput? A bit odd don't you think.