Surprise players

I was looking at some of the previous tournament results and I see that the top players usually win them. Has anyone experienced playing in a tournament where someone with a low rating has beaten everyone...ala a Bobby Fisher type?
Just curious to see if we have those types in here.

One hting to note is that that shows players current ratings. It may very well be a few people have won while on the rise, however since they rose to respectable levels, you can't tell what they won while still dvevloping their skills.