Well I read about this in an old Gamepro magazine about some guy watching Friday on his XBox and it started clicking and it shorted out, when he mentioned how it was hooked up on AV ports through his VCR the staff at Gamepro said that hooking it up like that and watching a DVD moive messes with the circutry, then my friend Nathan was watching a DVD movie on his XBox and it stopped working ever sence the day that happened.
Well if your scepticle, dont do it. I dont see anyway how it could be a problem though.