HM Customs (as in Her Majesty's - the Queen hates smuggling) has issued a warning against fake Nintendo DS Lites that can (possibly) cause you physical harm as well as financial.
A big batch of the fake handhelds (the UK is awash with them this Xmas, apparently) were seized in a freight depot raid and were found to have potentially dangerous power supplies. By 'potentially dangerous' they actually mean 'not electrically tested', so its not like they crawl across the room and strangle you in the night but there is a danger of fire or electrocution.
The bigger question for me is - just how fake are they? Do they play DS games? Are they just rebadged Game & Watch? The article says the were bought on 'Asian websites' for around £40, so goodness only knows what you are buying. Are there even any electronics in them?