Congrats on being chosen as a rho chi. I had a lot of fun as a PX (except that I missed not being able to attend my sorority's pref party

and nobody in my group went AEPhi

)
Let's see... I have a zillion stories
During campus preview weekend, when accepted students are invited to spend a few days on campus, IFC took out an ad in the student paper to promote rush. Sororities were part of IFC (as well as Panhel) at the time. So IFC decided to be helpful and print lists of the IFC and Panhel officers, so PNMs could contact them about rush. Trouble was, they included everyone's affiliations... so the PNMs knew the affiliations of the Panhel president, VP-rush, rush chair, and at least one rho chi.
During PX training, we did some role-playing to practice counseling PNMs in different situations. One of my fellow PXs had to play the role of a PNM who wanted to suicide - only she misinterpreted "suicide" and started talking about jumping off bridges
My fellow PXs tended to hang out in bunches by sorority. (bad idea) I was the only PX from AEPhi, so I tried to mix things up a bit and chat with PXs from different sororities, but wound up spending a lot of time with the PXs from one particular sorority. By the end of rush, most of my rush group had me pegged for being in that sorority... oops.
My roughest situation: I had to deal with a situation where a PNM was accidentally dropped by a group because her nickname was the same as the real name of a girl who did not rush, and they shared the same last name, so this sorority dropped the wrong PNM because she "didn't show up" to round 1. The situation didn't get straightened out until after round 2, and the round after that is pref. The sorority's rush chair told me they really liked the PNM and were inviting her to pref - then I had to talk to the PNM and reassure her that she wasn't out of the running, while not being allowed to tell her that she was going to be invited back (b/c invitations hadn't gone out yet). That was a tough conversation... but she ended up joining that sorority, so everything worked out well.