No, really, watch this one.
A huge mitigating factor is that I actually own a Ped-Egg. You are only supposed to go back and forth with the blades. A sideways swipe could cause some annoying cuts on the sole of your foot.
For bonus points, click through the video to read the comments on the video from foot fetishists and folks accusing the creator of being a bad parent. It's just a little amazing.