I always find it is fun when people come into my shop and I see a College tag on their car and ask oh, I see you went to ABC school.
Were you in a Fraternity/Sorority? They will say yes I was a so and so at ABC. How about you and I always say I am a LXA from ABC and am still active. I always found it amazing how much warmer people were after we talked a while about the Greek Days back when!
Just to name a few:
BTP
DDD
STG
KS
OSPhi
AKA
AKL
XO
While from different Organizations, there is still a common bond.