I don't think we have ever crossed in an unpleasant manner?
I was trying to join the "Quants" 16 player game of Quantum Entanglement and it took some investigatin' to find out why I couldn't.....
Just saw this. Couldn't remember for a minute. After digging I'm guessing it was this:
"Oh, I totally stabbed in him the back without warning after I had proposed a concrete one turn warning. Me = guilty."
Nothing personal. For me backstabbers constitute an unnecessary risk. Generally, the only enemies I make.