I started a 'knives only' Fight Club in 2.86, after we had all but given up on INF....
It was quite fun. Those of you who joined it know how much fun it was. We wore the '(FC)' tag at the end of our names and always met on maps with warehouses. If anybody played for 'real' (aka, used guns or nades), everybody, regardless of team would knife the person trying to ruin the tournament fights.
If we all get sick of 2.9, I'll start it up again and explain the rules...
(whoops, I broke the first two rules...)