Trust me, it happens.

I use it to work out which files are in fact the same encoded versions of episodes. People rename them.

It doesn't seem to rationalize the list either. If they're listed seperately, they stay seperate.

Do your Jackass search again and restrict it to video. Then look around the 200MB files. It happens reasonably often. You might have to leave it searching. It just depends who's sharing what but it does happen.