I can't find the video anywhere on Youtube (and Daily Motion isn't working for me right now), but Stephanie's up-close 'screaming' when Undertaker kidnapped her in the limo at Backlash 1999 was cringe-worthy to watch.
Also, pretty much every segment from that stupid "Embrace The Hate" storyline between Cena and Kane in 2012. Especially when Cena is making the angry face at the camera. I guess this was WWE's attempt at channeling The Joker/Batman "everyone can be corrupted" plot point from The Dark Knight (they did a slightly better job at it with the Cena/Wyatt feud earlier this year... at least Cena wasn't seen making any comically angry faces while staring at the camera this time around.)