I had a guy wearing horned shoes follow me around and throw Lucky Charms under my feet as I walked. It was by far the most creative and funny taunt I have received. Otherwise, Pitt fans (mostly girls) dropping the f-word in our face was worst we've seen.
There is a direct correlation between one's size/intimidation factor and the amount of heckling they receive. I'm 6' and 260 pounds so I don't get heckled as much as my 5'9' friend who weighs 165.