At my campus, at least back when I was there, the only serious rivalry was Fiji and ZBT. Their houses were right next door, and if they weren't pissing each other off, the Sigma Chis, who lived across the street, were instigating something (TP the Fijis and blame the Zebes!).
The other rivalries were very casual or friendly - Phi Psi and Phi Kap because people mixed up their names, for example.
__________________
Alpha Xi Delta
|