No, it's not the lead-up to a lame joke about looking in the mirror, it's a clever website designed to let you test your own life accomplishments against people just like yourself. Plug in some accomplishments, wait about a month, then check your rankings--you might be astounded, you might be proud, and you might want to delete the last few off there because it can be fairly humiliating.
The highest I've attained yet is a 71st percentile, the lowest...well, the lowest was a cheap plug for this blog, which didn't work, so I deleted it. *lol* See, the problem is that someone out there isn't pulling his or her weight in telling everyone, EVERYONE about this blog. Shame on you.