via someecards.com I'll be the first to admit it: I've never known this until right now. This is coming from somebody that spent a lot of time working in kitchens and in my own at home. I've always kept this handy-dandy kitchen tool straight up and down, and then tried not to impale myself on the freshly-cut, metal lid afterwards. No, according to this video, the tool should be laid flat on top of the can so the MAGNET attached safely lifts the lid up and away from your food.
After seeing this, I feel just like I did last month when I found out that the Game of TAG we played as kids is really just an acronym for "Touch And Go"