Way, way back I had a season where I had three people want to be my friend, and I accepted them. Turned out that they were friends also of my biggest rival for the Championship, and they all turned up (along with about 4 others) to support him at the match that would settle the Championship at the end of the season, and I was playing AWAY. After going 0-2 down I swapped a few players about, made a sub and went hard attacking - and eventually won the match 4-2 and the Championship...
The motto 'In Victory, Malice; In Defeat, Revenge' was modified a bit when I immediately at the end of the match 'unfriended' the turncoats...