Okay. I am a math/physics geek, as you might have guessed by now, but I am not exclusively interested in math and physics! Believe it or not, I am able to talk about things that don't involve the word "quanta," and which don't need to be proved by induction.*
In fact, I am really fond of music! I often sing with a swing band that tours around the country, these days! I really love to talk about music, despite the fact that I am a complete Neanderthal when it comes to music theory. If you can educate me, be my guest!
I also like to talk about books! I've gone through phases of just reading books of religious import (The Tao Te Ching, The Old Testament, Siddhartha, etc), because I think that stuff is really interesting and fun to learn about! I have also done an examination of WWII/ the Holocaust, a foray into futuristic dystopian societies, an exploration of some modern physical theories, and even a short-lived inquiry into the wonderful world of poetry!
So, I'm sure that we can find something in common, even if you don't know why the application of the "universal homomorphism property" is funny**
*(This is a rare quality in physics people, I have noticed; in my experience, my particular subset of interests (theoretical nuclear) tends to be associated with social ineptitude. On that note: if you like really terrible math and physics jokes, I have a few to share!)
**After explaining this to a few people, I have discovered that this is a perfect demonstration of the relativity of qualifiers such as "funny."