That's the one! I used to love that; it was so original there was no way any other house would have any idea how to rip it off from us!!
I learned this one from a sister from Duke, which was really great for regrouping after final party of a long recruitment day:
Leader:
All right, all right, all right (group: all RIGHT!)
L:
Ok, Ok, Ok (group: OK!)
L:
All right (group: All right!)
L: OK! (group: OK)
All: ALPHA OMICRON PI,
HEY!