Never any physical altercations. Got into many arguments/debates, particularly with an old high school/college friend of mine constantly. He was a Raider fan, hated the Bills and loved to debate. He'd constantly antagonize, which just made me love the Buffalo Bills more. I've had the same with a Fish fan who is a buddy of mine in recent years.
When that day comes for us all and our team finally lifts the Lombardi trophy, it will be more grand than any other team's fans... outside of maybe Cleveland.