I don't remember one.

I'm sure a Calacanis or a Wilson would have exposed a crooked VC with show & stow tactics.

Others have been flogged quite publicly.

Source:

https://news.ycombinator.com/item?id=893845

http://betabeat.com/2011/12/pay-to-pitch-how-much-is-too-muc...

http://www.avc.com/a_vc/2009/10/paying-to-pitch.html