This is a video of a man repeatedly dropping neodymium magnets through a thick copper pipe and watching them slooooowly fall through (previously: a similar experiment). Magnets: they're amazing. And as someone in the Youtube comments pointed out, I particularly liked the part at 1:11 when he forgets which hand is holding the magnet and he drops the pipe instead. That sort of thing happens to me all the time. Like when I'm driving and mean to hit the brake but hit the gas instead and now I'm parked on my neighbor's porch. Nice hummingbird feeder.
Keep going for the video.
Thanks to carey, who agrees there should be entire high school science classes dedicated to learning about magnets.