This photo is taken from Greek's fall finale. The episode is titled "Friend or Foe."
Added:
This is a scene from the Greek fall 2009 finale. The episode is titled "Friend or Foe."
Added:

Greek Season 3 Episode 10 Quotes

We're all going to go to girl jail like those prison movies my boyrfriend watches!

Betsy

We'll know if we did it, when we get in trouble for it, but until then, we say nothing!

Casey