Speaking of Greek parody groups, we have a 'chapter' of Lambda 'Cash Money' Pi at GMU.
Here's a link to their site:
Lambda 'Cash Money' Pi
One of my friends talked to a member of theirs and says he was actually alright--that few of them are really anti-Greek.
All I've seen of them is the one day they all wore the Lambda 'Dollar Sign" Pi lettered shirts.