Can't locate videos on iPod Touch

I'm trying to sync my iPod Touch. On the colored storage bar at the bottom of the screen iTunes is telling me that I have 4.2 GB video content on the device, which I CANNOT LOCATE.

I have removed every iTunesUni item, every single podcast, I have never recorded any video myself but checked the Video app anyway (it's empty), and there seems to be no way to find out from iTunes WHERE these videos are!

Please help. How could I free this space?