I've had a few small NIB (neodymium iron boron) magnets for quite some time now... About the size of a button cell battery and very strong... Strong enough to put one on either side of your hand and have them stay, pull nails from several inches, demagnitize floppies at a distance, etc.. I bought a full size 60GB hard drive off ebay that ended up not working, and decided to take it apart for its magnets. This is no ordinary 3.5inch drive bay drive, it takes up two full size 5 1/4" drive bays and weighs about 10lbs... Inside most hard drives are two powerful NIB magnets, but the ones inside this drive were FREAKING HUGE. While taking them apart, they accidentally snapped together. Glad my hand wasn't there, or it would have been broken. They're permanantly mounted on aluminum plates, which is a good thing, or they'd still be together now... The only way I was able to get them apart was to put chain through the screw holes in the aluminum plates, tie one magnet to a beam in the garage, one to the tow hook of the Civic, and hit reverse. I backed up slowly to be careful, and they stopped the motion of the car. I had to rev to a good 2000 rpms to get them to seperate! Let's just say I'm never letting these magets near each other again... It's fun to stick the sunday paper to the fridge though.